Estimating Products

Estimating Products

Ms. Poole

Estimate​:

Key words: about​, round, compatible numbers, approximately

Multiple Choice

Factors are...

• numbers being pulled apart

• a variable

• an equation

• numbers being multipled

Multiple Choice

The product is...

• imported goods

• toys

• equation

• answer to multiplication problem

Multiple Choice

What is the first step in estimating 53 x 28?

• Solve the problem.

• Round the numbers

Remember:

If the problem does not tell you which place to round to, you round to the HIGHEST place value

Multiple Choice

Estimate the number 46

• 40

• 46

• 50

Multiple Choice

Estimate the number 317

• 300

• 350

• 400

Multiple Choice

Estimate the number 5,924

• 5,000

• 5,900

• 6,000

Multiplying by 10's, 100's, 1,000's

Multiple Choice

2,560 x 32

estimates to

3,000 x 30 = ___

• 81,920

• 90,000

• 80,000

Remember:

You do not need to round single digit numbers!

Multiple Choice

342 x 6

estimates to

300 x 6 = ____

• 2,052

• 180

• 1,800

• 1,200

Multiple Choice

3,122 x 85

estimates to

3,000 x 90 = _____

• 265,370

• 270,000

• 300,000

Multiple Choice

Which expression would be best to use for 62 x 23?

• 60 x 20

• 60 x 30

• 60 x 2

• 6 x 2

Multiple Choice

If you are estimating 92 x 12, which expression would be best to use?

• 100 x 20

• 90 x 12

• 100 x 30

• 90 x 10

Multiple Choice

• Yes.

• No, the answer is 36,000

• No, the answer is 27,000

• No, the asnwer is 2,700

Multiple Choice

Estimate the product of 99 X 7

• 70

• 700

• 7,000

• 7

Multiple Choice

Estimate. 62 X 3 =

• 180

• 210

• 150

• 240

Multiple Choice

Estimate. 834 x 10=

• 80

• 800

• 8,340

• 8,000

Multiple Choice

Estimate. 272 X 5=

• 1,000

• 1,500

• 1,300

• 2,000

Multiple Choice

Estimate. 730 X 4=

• 3,200

• 280

• 2,800

• 28,000

Multiple Choice

Estimate.  58 x 61 =

• 3,000

• 4,000

• 3,600

• 360

Multiple Choice

Estimate. 27 x 12

• 30

• 20

• 200

• 300

Multiple Choice

Why do we estimate numbers?

• We estimate because our math teachers say so.

• Estimating makes math calculations easier.

• Estimating is on the STAAR test.

• Incorrect 8,000

  We estimate because it makes math more difficult.