Encourage students to share their strategies. Some students might use paper and pencil to solve the problems while other students solve them in their heads using skip counting and other counting strategies.
60
70
110
130
150
Possible response: I split 60 into 30 + 30 so I could make 100 with 70. I thought 70 + 30 + 30 + 20 = 100 + 50, or 150.
