This model represents 157. You want to add keep adding ones blocks to the model until it stands for 170. How many ones blocks should you add?
13
20
10
3
This model represents 157. You want to keep adding ones blocks to the model until it stands for 170. How many ones blocks should you add?
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To find out how many one blocks you need to add to the model representing 157 to reach 170, you can subtract 157 from 170.
170 – 157 = 13
So, you need to add 13 one blocks to reach a total of 170.