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understanding addition Worksheets

This Understanding Addition section provides 7 essential worksheet types designed to build foundational math skills for kindergarten through first grade students. Activities include matching visual equations to number sentences, finding missing numbers to make 10, breaking apart two-digit numbers into tens and ones, and practicing counting skills within 20.

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Kindergarten 1st Grade

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Understanding Addition

About these worksheets

These worksheets introduce students to the foundational concepts of addition. Activities include matching pictures to addition sentences, identifying number pairs that make 10, breaking apart two-digit numbers into tens and ones, and counting up and down within 20. Designed primarily for kindergarten and first grade, these resources help young learners connect visual representations to number sentences and build early number sense before moving on to traditional addition problems.

understanding addition Worksheets - Matching Addition worksheet

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Matching Addition

koa1

Match a picture of objects to the addition sentence that shows the same total.
Count items in two groups and add them to find how many there are altogether.
Use the plus sign and equals sign to understand that two different-looking equations can mean the same thing.

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understanding addition Worksheets - Which Equals worksheet

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Which Equals

koa3

Practice figuring out which addition expressions equal a given number
Learn that more than one addition problem can have the same answer
Check basic addition facts by deciding if each expression matches the target number

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understanding addition Worksheets - Addition Boxes (to ten) worksheet

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Addition Boxes (to ten)

koa2

Add numbers up to 10 to make a total.
Identify two smaller numbers that can be used to make a larger number.
Find a missing part when you know the whole and the other part
Build understanding that a number can be split into different combinations that add up to the same total

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understanding addition Worksheets - Finding 1 More and 1 Less worksheet

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Finding 1 More and 1 Less

Find the next number by adding 1 to a given number.
Find the previous number by subtracting 1 from a given number.
Use counting order to decide which number is 1 more or 1 less.
Connect the words more, less, next, and previous to the correct math action.

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understanding addition Worksheets - Adding to Ten worksheet

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Adding to Ten

koa4

Find the missing number that pairs with another number to make 10.
Build speed and confidence with addition facts that add up to 10.
Notice patterns in complements to 10 (like 1 goes with 9, 2 goes with 8).

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understanding addition Worksheets - Breaking Apart Tens and Ones worksheet

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Breaking Apart Tens and Ones

1nbt2b

Break a two-digit number into tens and ones (like 47 = 40 + 7).

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understanding addition Worksheets - Counting Up and Down worksheet

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Counting Up and Down

1oa5

Practice counting up from a given number to find a larger number
Practice counting down from a given number to find a smaller number
Connect counting up and counting down to basic addition and subtraction

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