Rounding and Estimation with Multiplication (Gr. 4, Obj. 2.3)

Estimate the product 72 x 97.

• 6,300
• 8,000
• 7,000
• 6,400

Tags

CCSS.4.NBT.B.5

Which shows the best estimate to use for estimating 37 × 63?

• 40 × 70 = 2,800
• 50 × 60 =  3,000
• 40 × 60 =  2,400
• 30 × 60 =  1,800

Tags

CCSS.4.NBT.B.5

Round to the nearest ten to estimate:

37 x 41

• 40 x 40 = 1600

• 30 x 40= 1200

• 35 x 50 = 1750

Use rounding to estimate:
33 x 82 

• 30 x 20 = 600 
• 30 x 80 = 2400
• 30 x 90 = 2700 

Tags

CCSS.4.NBT.B.5

Use rounding to estimate: 
56 x 72 

• 60 x 70 = 4200
• 6 x 70 = 420 
• 50 x 70 = 3500 

Tags

CCSS.4.NBT.B.5

The product of 42 X 83 is closest to

• 4,000

• 3,600

• 3,200

• 2,700

The product of 64 X 99 is closest to

• 5,400

• 7,000

• 6,000

• 6,500

Without multiplying, how do you know that 45 X 9 is less than 450?

• Because 45 X 9 = 405

• 45 X 9 is less than 450 because it is equal to 405.

• 45 X 10 = 450. Since 9 is less than 10, 45 X 9 is less than 450.