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Adding and Subtracting within 20

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Add two numbers where the total is 20 or less.

2oa2 Sort By Grade Worksheets - Addition and Subtraction (Horizontal) worksheet

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Addition and Subtraction (Horizontal)

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Practice adding numbers to find a total.
Practice subtracting numbers to find how many are left or the difference.

2oa2 Sort By Grade Worksheets - Adding 9s worksheet

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Adding 9s

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Practice quickly adding 9 to a number.
Use a mental math trick for +9, like add 10 then subtract 1.
Build speed and accuracy with basic addition facts involving 9.
Recognize patterns when numbers increase by 9.

2oa2 Sort By Grade Worksheets - 3s (horizontal) worksheet

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3s (horizontal)

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Add 3 to another number quickly and correctly.
Recognize and remember the addition facts for 3 (like 3+7 and 3+9).

2oa2 Sort By Grade Worksheets - 4s worksheet

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4s

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Practice adding 4 to numbers from 1 to 10.
Memorize and recall the addition facts in the 4s family quickly.
Build speed and accuracy with simple mental addition.

2oa2 Sort By Grade Worksheets - 4s (horizontal) worksheet

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4s (horizontal)

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Add 4 to numbers from 1 to 10 quickly and correctly.
Build speed and confidence with mental math for simple addition.

2oa2 Sort By Grade Worksheets - 5s worksheet

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5s

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Practice adding 5 to another number to find the total quickly.
Memorize and recall the addition facts for 5 + 1 through 5 + 10.
Build speed and accuracy with simple addition without using fingers or a calculator.

2oa2 Sort By Grade Worksheets - 5s (horizontal) worksheet

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5s (horizontal)

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Memorize and recall the “5 plus” addition facts without counting.
Build speed and accuracy with simple addition in your head.

2oa2 Sort By Grade Worksheets - 6s (horizontal) worksheet

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6s (horizontal)

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Add 6 to a number from 1 to 10 quickly and correctly.
Memorize and recall the addition facts for the 6s.
Build speed and confidence with mental math when adding a small number to 6.

2oa2 Sort By Grade Worksheets - 7s worksheet

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7s

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Practice adding 7 to numbers from 1 to 10 quickly and accurately.
Memorize and recall the basic addition facts that start with 7.
Build speed with mental math when one addend is 7.

2oa2 Sort By Grade Worksheets - 7s (horizontal) worksheet

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7s (horizontal)

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Add 7 to a number from 1 to 10 quickly and accurately.
Memorize the addition facts for 7 (like 7+6 and 7+9).
Use mental math to find sums without counting one by one.

2oa2 Sort By Grade Worksheets - 8s worksheet

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8s

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Practice adding 8 to a number from 1 to 10.
Learn the addition facts in the 8s family so they come to mind quickly.
Build speed and accuracy with simple addition without using fingers or a calculator.

2oa2 Sort By Grade Worksheets - 8s (horizontal) worksheet

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8s (horizontal)

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Add 8 to a number quickly and accurately.
Recall the addition facts for 8 + 1 through 8 + 10 from memory.
Use mental math to find sums when one addend is 8.

2oa2 Sort By Grade Worksheets - 9s worksheet

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9s

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Practice adding 9 to a number from 1 to 10.
Get faster at 9s addition facts without using fingers or a calculator.
Use a quick strategy like “add 10, then subtract 1” to solve 9s facts.

2oa2 Sort By Grade Worksheets - 9s (horizontal) worksheet

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9s (horizontal)

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Practice adding 9 to a number from 1 to 10.
Use mental math to add 9 by thinking “add 10, then take 1 away.”
Build confidence with quick, accurate addition without counting on fingers.

2oa2 Sort By Grade Worksheets - Mixed worksheet

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Mixed

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Add two numbers from 1 to 10 quickly and accurately.
Recall basic addition facts without counting on fingers.
Build speed and confidence with mixed addition facts.

2oa2 Sort By Grade Worksheets - Mixed (horizontal) worksheet

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Mixed (horizontal)

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Add two numbers from 1 to 10 quickly and accurately.
Recall basic addition facts without counting on fingers.

2oa2 Sort By Grade Worksheets - 1s worksheet

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1s

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Practice subtracting 1 from a number quickly and accurately.
Notice that subtracting 1 means finding the number right before it in counting order.
Build speed and confidence with simple subtraction you can do in your head.

2oa2 Sort By Grade Worksheets - 1s (horizontal) worksheet

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1s (horizontal)

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Practice subtracting 1 from a number quickly and accurately.
Notice that subtracting 1 makes a number one less and changes only the last digit most of the time.
Build speed with basic subtraction facts for mental math.

2oa2 Sort By Grade Worksheets - 2s worksheet

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2s

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Practice subtracting 2 from a number quickly and accurately
Get comfortable counting back by 2s to find a difference
Build confidence with basic subtraction facts and mental math speed
Notice patterns when numbers go down by 2 each time

2oa2 Sort By Grade Worksheets - 2s (horizontal) worksheet

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2s (horizontal)

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Practice subtracting 2 from a number quickly and accurately.
Get comfortable counting back by 2s to find the difference.
Build subtraction fact fluency so answers come more automatically.

2oa2 Sort By Grade Worksheets - 3s worksheet

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3s

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Practice subtracting 3 from a number quickly and accurately.
Get comfortable counting back three steps to find the difference.
Build fluency with subtraction facts that use 3.
Improve mental math speed when taking away a small number.

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3s (horizontal)

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Practice subtracting 3 from a number quickly and accurately.
Get comfortable counting back by 3s to find the difference.
Build speed with basic subtraction facts that use 3.

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4s

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Practice subtracting 4 from a number quickly and accurately.
Get comfortable finding the difference when taking away 4.
Build speed with subtraction facts so answers come more easily in your head.

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4s (horizontal)

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Practice subtracting 4 from a number quickly and accurately.
Get comfortable using subtraction facts with 4 to find the difference.
Build mental math speed by counting back 4 in one step.

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5s

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Practice subtracting 5 from a number quickly and accurately.
Get comfortable counting back by fives to find the difference.
Build subtraction fact fluency so answers come faster in your head.
Notice patterns when you take away 5 (like the ones digit changing in predictable ways).

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5s (horizontal)

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Practice subtracting 5 from different numbers quickly and accurately.
Get comfortable counting back by fives to find a difference.
Build speed with basic subtraction facts that use 5.
Strengthen mental math by doing subtraction without using objects or a number line.

2oa2 Sort By Grade Worksheets - 6s worksheet

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6s

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Practice subtracting 6 from a number quickly and accurately.
Get comfortable using subtraction facts for 6 without counting every time.
Build mental math speed when taking away 6 from different starting numbers.
Notice patterns in the 6s subtraction facts to help you answer faster.

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6s (horizontal)

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Subtract 6 from a number quickly and accurately.
Use subtraction facts with 6 to find differences without counting every time.
Build speed and confidence with mental subtraction.
Notice patterns when taking away 6 (like the answer going down by 6 each time).

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7s

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Subtract 7 from a number quickly and accurately.
Use the idea of “take away 7” to find the difference between two numbers.
Build speed and confidence with the 7 subtraction facts for mental math.
Notice patterns when counting back by 7 to help solve problems faster.

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7s (horizontal)

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Practice subtracting 7 from a number quickly and accurately.
Get comfortable using subtraction facts to find the difference without counting one by one.
Build speed and confidence with mental subtraction.
Notice patterns when you keep taking away 7 from different numbers.

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8s

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Subtract 8 from a number quickly and accurately.
Use subtraction facts to find the difference without counting one by one.
Notice patterns when taking away 8 to help solve problems faster.
Build speed and confidence with mental subtraction.

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8s (horizontal)

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Subtract 8 from a number quickly and accurately.
Use the idea of “take away 8” to find the difference between two numbers.
Build speed and confidence with subtraction facts involving 8.
Do subtraction in your head by counting back 8 or using a known fact.

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9s

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Get quick and accurate at subtracting 9 from a number.
Use mental math shortcuts for minus 9, like subtract 10 and add 1 back.
Pay attention to place value when subtracting 9 across tens (like 40 − 9).
Build subtraction fact fluency so answers come without counting.

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9s (horizontal)

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Practice subtracting 9 from a number quickly and accurately.
Get comfortable using mental math tricks for minus 9 (like subtract 10, then add 1).
Build speed and confidence with subtraction facts to improve overall math fluency.
Pay attention to accuracy when subtracting across different starting numbers.

2oa2 Sort By Grade Worksheets - Subtraction Drills (Missing Minuend) worksheet

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Subtraction Drills (Missing Minuend)

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Find the starting number in a subtraction problem when the top number is missing.
Use the relationship between subtraction parts (start, take away, and what’s left) to fill in the blank.
Build speed and accuracy with basic subtraction facts while working backward to the missing number.

2oa2 Sort By Grade Worksheets - Subtraction Drills (Missing Minuend) Horizontal worksheet

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Subtraction Drills (Missing Minuend) Horizontal

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Figure out the starting number when you know what was taken away and what’s left.
Write and solve subtraction equations with a blank in the first spot (___ − number = number).
Use the relationship between subtraction and addition to find the missing number.
Build speed and accuracy with basic subtraction facts and mental math.