A math addition square is a puzzle in which you must add vertical and horizontal series of numbers. This type of activity is an effective way to give elementary school students practice in addition. The fact that it's a puzzle makes it more fun and usually holds students' attention better than standard sets of addition problems.
Add all the numbers in the first vertical column.
Write the answer to Step 1 just below the first column.
Continue this procedure for all other vertical columns in the puzzle.
Add all of the numbers in the first horizontal row.
Write the answer to Step 4 to the right of the last number in the first horizontal row.
Continue this procedure for all other horizontal rows.
Check your work once you're finished to be sure that you didn't make any errors.