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.

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

What is the estimated product of Ronald’s factors?

Mathematical Equivalence

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Tags

5.3.A

Estimate  75 x 74 

• 5,550

• 5,600

• 56,000

Estimate the product of 9 x 217

• 1,953

• 1,800

• 2,700

• 2,000

Estimate 36 x 58

• 2088

• 2100

• 2400

• 1800

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

70 x 800 = _____

Estimate 86 x 92

• 810

• 8100

• 81,000

• 7,912