Have base-ten pieces, desk number
lines, 200 Charts, and Addition Strategies Menus readily available.
Students may also use open number
lines and mental math strategies.
Possible responses:
84; 45 = 40 + 5 + 39 = 30 + 9 70 + 14 = 84
I used the 200 Chart to count
up: move 4 spaces down, 45, 55, 65, 75, 85, then 1 space left, 84.
100; 52 + 48 = 50 + 2 + 48 and 50 + 50 = 100
N. Addition Practice
Show or tell how to solve each problem using a different strategy or
tool.