Estimation With Multiplication

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.

Using estimation, 36 x 69 is closest to...

• 1800

• 2800

• 2400

• 1200

8 x 3,000

• 24,000

• 2,400

• 11,000

700 x 40

• 2,800

• 280

• 28,000

10 x 800

• 80

• 8,000

• 800

600 x 700

• 420,000

• 4,200

• 42,000

900 x 30

• 2,700

• 270

• 27,000

50 x 700

• 35,000

• 3,500

• 12,000

90 x 2,000

• 18,000

• 180,000

• 1,800