Add/Sub/Mult/Div
- Figure out the missing input or output number when a machine adds, subtracts, multiplies, or divides by a rule.
- Use the given input-output pairs to identify the operation and number being used in the rule.
- Work backward through an operation to find an unknown value (like undoing +, −, ×, or ÷).
- Check that a rule works for more than one pair in the table before filling in the blank.
