Whole Number Estimation

Estimate the product:
41 x 23

• 40 x 30 = 1200
• 41 x 23 = 943
• 50 x 20 = 1000
• 40 x 20 = 800

Estimate the product:
29 x 312

• 900
• 9,000
• 8,000
• 9,048

Estimate the product:

685 x 391

• 20,000

• 1,000

• 28,000

• 200

Estimate the area of a rectangle that measures 57mm x 41mm

• 5,500mm

• 100mm

• 2,400mm

• 2,000mm

20 x 700

• 10,000

• 1,400

• 14,000

• 1,200

Solve mentally.
15 x 2,000

• 30,000
• 12,000
• 3,000
• 300,000

Which is the best estimate of 32 x 49 using rounding or compatible numbers?

• 1,500
• 150
• 120
• 1,200

Solve mentally.
60 x 120

• 7,200
• 6,300
• 5,400
• 8,400

Estimate by rounding.
89 x 13

• 900
• 1,100
• 100
• 90

Product

• the answer to a multiplication question
• the answer to a division question
• the answer to a subtraction question
• the answer to an addition question