Missing addends (sum 20 or less)

Harder mental addition

Student name (optional)

Printed on the worksheet and the reward star. We never save it.

Choose a worksheet

Customize

Problems

Numbers to add

Smallest total

Largest total

Where the blank goes

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Sheet

Number of problems

Up to 36 fit on one page with these choices.

Worked example

Pictures

Game

Include answer key

Reward star

Paper:

Every click makes a new set of problems.