5.NBT.B.7 (Pt. 3)

Name (First and Last)

Tags

CCSS.L.1.1B

CCSS.L.2.2C

CCSS.L.3.2D

1) Estimate the sum.

2) Estimate the difference.

3) A scientist collects two rocks. One rock has a mass of 3.78 kilograms. The other rock has a mass of 8.24 kilograms. Is it reasonable to say that the difference between the masses of the rocks is about 7 kilograms? Explain.

4) Which is a reasonable estimate for the sum 21.34 + 6.45?

• A) 27

• B) 28.5

• C) 29

• D) 32

5) Shakira estimates the sum $14.42 + $9.93. Which could be a reasonable estimate for the sum? Select all that apply.

• A) $20

• B) $22

• C) $24

• D) $24.50

• E) $30