Multiplying 2-Digit by 2-Digit Numbers

Using Mental Math, Which Product is 2,400?

• 20 x 40

• 30 x 90

• 30 x 80

• 40 x 70

Cindy earns $36 a week at her part-time job. Which is the best estimate of how much Cindy earns in a year? Remember there are 52 weeks in a year.

• $1,500

• $1,000

• $2,000

• $2,400

Estimate by rounding to the nearest ten. 73 × 37

• 2,100

• 2,800

• 210

• 280

Mary has 13 spools of rope. Each spool holds between 36 and 45 meters of rope. Which could be the total number of meters of rope she has on these spools?

• 500 m

• 400 m

• 650 m

• 350 m

Estimate. Which plants cost more than $600 in all?

• 38 plants for $11 each

• 27 plants for $18 each

• 21 plants for $19 each

• 32 plants for $20 each

Catrina bought 3 rings at $4 a ring and 4 bracelets at $6 a bracelet. She paid with two $20-bills. How much change did she receive?

• $16

• $12

• $6

• $4

Marsha buys 6 necklaces for $8 each. She buys 3 pairs of earrings for $14 each. How much money does Marsha spend in all?

• $90

• $84

• $80

• $74

Estimate the product of 99 X 7

• 70
• 700
• 7,000
• 7

Tags

CCSS.4.NBT.A.1

CCSS.4.NBT.B.5

Estimate.  58 x 61 =

• 3,000
• 4,000
• 3,600
• 360

Tags

CCSS.4.NBT.B.5

Which estimate is closest to 81 × 28?

• 80 x 20 = 1,600

• 80 x 30 = 2,400

• 90 x 20 = 1,800

• 90 x 30 = 2,700