1. Adding Up in Chunks Decompose and associate number to add efficiently.

2. Category 1

12. Category 2
Adding multiples of tens while keeping on number whole and then breaking apart the ones into friendly combinations.
Example: could be “chunked” as = 48; the 4 could be broken into so that = 50; = 52

22. Category 3
Adding multiples of tens and one hundred while keeping one number whole.