The document discusses shortcuts for adding long columns of numbers. It recommends looking for combinations of 10 that can be added together first. Once combinations of 10 have been identified, those numbers should be added up initially before adding the remaining numbers. When a number repeats, multiplication can be used instead of repeatedly adding the number.

1. Shortcuts in Addition By Monica Yuskaitis

2. Adding Long Columns Since addition is Commutative it doesn’t matter which numbers you add first. 4 + 2 + 5 + 1 = 12 1 + 4 + 5 + 2 = 12

3. Adding Long Columns Begin by looking for combinations of ten. 34 57 83 26 +

4. Adding Long Columns Add up your ten combinations first. 34 57 83 26 + 0 2

5. Adding Long Columns Add up your ten combinations again. 34 57 83 26 + 0 2 2 0

6. Review Combinations of Ten 1 + = 10 5 + = 10 8 + = 10 7 + = 10 2 + = 10 6 + = 10 4 + = 10 3 + = 10 9 + =10 9 2 8 6 1 4 7 5 3

7. Adding Long Columns When a number keeps repeating use multiplication. 32 36 88 26 36 + 8 2

8. Adding Long Columns When a number keeps repeating use multiplication. 32 36 88 26 36 + 8 2 2 1