Estimating and Multiplication

Isabelle has 6 ant farms. Each ant farm has 89 ants. Which of the following shows a reasonable estimate of how many ants Isabelle has?

• 7x125=875

• 8x110=880

• 6x90=540

• 10x100=100

Tags

CCSS.4.NBT.B.5

243 x 8

• 1,952

• 1,944

• 1,864

• 1,954

Tags

CCSS.4.NBT.B.5

How would you estimate 67 x 44

• 70 x 40

• 70 x 50

• 67 x 44

• 67 x 50

Answer explanation

when you estimate you round numbers so that they are easier to complete with mental math.

Tags

CCSS.4.NBT.B.5

82 x 900 = _____

Tags

CCSS.5.NBT.B.5

49 x _____ = 4900

Tags

CCSS.5.NBT.A.2

36 x 7 =

Tags

CCSS.4.NBT.B.5

70 x 800 = _____

Tags

CCSS.4.NBT.B.5

Estimate the product
92 x 12

• 100 x 10

• 100 x 12

• 90 x 20

• 90 x 10

Tags

CCSS.4.NBT.B.5

452 x 1000 = _____

Tags

CCSS.5.NBT.A.2

Maria runs 11 miles a day. She runs 24 days during the month of January. How many miles did she run total for the entire month?

• 210 miles

• 300 miles

• 286 miles

• 264 miles

Tags

CCSS.3.OA.A.3