Estimating Multiplication

Sam was buying extra pencils. He bought 27 packs with each pack having 43 pencils in it. Which expression shows about how many pencils he bought?

• 30 x 20

• 40 x 30

• 20 x 40

• 20 x 50

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

Which shows the best estimate of the product of 87 and 6?

• 80 x 6 = 640

• 90 x 6 = 540

• 90 x 10 = 5,400

• 80 x 10 = 800

Tags

CCSS.4.NBT.B.5

What is the estimated product of Ronald’s factors?

Mathematical Equivalence

OFF

Tags

5.3.A

Estimate  75 x 74 

• 5,550

• 5,600

• 56,000

Tags

CCSS.4.NBT.B.5

Estimate the product of 9 x 217

• 1,953

• 1,800

• 2,700

• 2,000

Tags

CCSS.4.NBT.B.5

Estimate 36 x 58

• 2088

• 2100

• 2400

• 1800

Tags

CCSS.4.NBT.B.5

An office needs to buy 6 computers.  Each computer costs $384.  About how much money will the office spend?

• $1,800

• $2,400

• $2304

• $3000

Tags

CCSS.5.NBT.B.7

70 x 800 = _____

Tags

CCSS.5.NBT.B.5

Estimate 86 x 92

• 810

• 8100

• 81,000

• 7,912

Tags

CCSS.4.NBT.B.5