Estimating Products of Multi-Digit Numbers

889 x 300
estimate 

• 240,000

• 270,000

• 450,000

Estimate.  58 x 61 =

• 3,000

• 4,000

• 3,600

• 360

Estimate.
19 x 74

• 700

• 140

• 1,400

• 14,000

Estimate:
27 x 12

• 30

• 200

• 20

• 300

When estimating products, you round to...

• The smallest place value

• The biggest place value

George's school was collecting cans for recycling. They had 81 bags with 5 cans inside each bag. About how many cans did they collect? Choose the expression that shows how to estimate for this problem.

• 81 x 5

• 90 x 5

• 80 x 5

• 70 x 5

Sam was buying extra pencils. He bought 27 packs with each pack having 8 pencils in it. How many pencils did he buy in all? Choose the expression that shows how to estimate for this problem.

• 27 x 10

• 30 x 8

• 20 x 8

• 25 x 8

Why do we estimate numbers?

• We estimate because our teachers say so.

• We estimate because it makes math more difficult.

• Estimating makes math easier to solve.

Estimate. 27 x 12

• 30

• 200

• 20

• 300

52 x 57

• 2,500

• 3,600

• 3,000

• 2,964