Question

Martin had 7 pounds of grapes left, and he gave away 25 of them. Explain how to use compatible numbers to estimate the amount of grapes he gave away.

Answer 1

+7-25=-18 is the correct answer

Answer 2

Answer:

Sample response:  

2

5

is close to  

1

2

, and it is easy to find  

1

2

of 7 mentally. Half of 7 is 3.5, so Martin gave away about 3.5 pounds.

Step-by-step explanation:

-,-