Worksheet: Estimating Products of Decimals and Whole Numbers

In this worksheet, we will practice using rounding and compatible numbers to estimate the product of a decimal and a whole number.

Q1:

Estimate 57×62.

  • A10
  • B50
  • C9
  • D45
  • E40

Q2:

Estimate 7712×829.

  • A16
  • B56
  • C64
  • D72

Q3:

Consider the product 872×0.082.

Estimate the product by rounding each number to its greatest place value.

Calculate the product.

Q4:

Use your rounding skills to estimate 42×399.

  • A18,000
  • B20,000
  • C1,600
  • D16,000
  • E12,000

Use the standard algorithm to find the exact answer.

Hint: Use your estimate to check your answer.

Q5:

We can estimate products by rounding each number to its greatest place value as in the example.

Use this method to estimate the following products.

Estimate 86×0.328.

Estimate 717×0.901.

Q6:

Which of the following is closest to 5×103×60? Solve without using a calculator.

  • A3,000
  • B40,000
  • C300,000
  • D30,000

Q7:

Noah estimates that 𝜋 is 9 and his friend Jacob estimates that it is 10. Whose estimate is more accurate?

  • AJacob
  • BNoah

Q8:

7 7 . 4 9 × 1 0 to the nearest unit.

Q9:

9 9 . 5 2 5 × 1 0 to the nearest tenth.

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