Kids are presented with the problem of finding the missing numbers to each of nine 100s squares. They'll need to subtract and add to make each puzzle equal 100. Great challenge or daily warm-up activity.

In this power up addition worksheet, 2nd graders use the numbers from 2 to 12 to fill in the missing addends for 10 addition problems.

In this addition with decimals worksheet, students find the missing addends in these problems. Answers are given by clicking a link. An excellent in-class activity, or homework assignment.