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 5 7 × 6 2 .

  • A10
  • B9
  • C50
  • D45
  • E40

Q2:

Estimate 7 7 1 2 × 8 2 9 .

  • A16
  • B72
  • C56
  • D64

Q3:

Consider the product 8 7 2 × 0 . 0 8 2 .

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

Calculate the product.

Q4:

Use your rounding skills to estimate

  • A 2 0 0 0 0
  • B 1 8 0 0 0
  • C 1 2 0 0 0
  • D 1 6 0 0 0
  • E 1 6 0 0

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 8 6 × 0 . 3 2 8 .

Estimate 7 1 7 × 0 . 9 0 1 .

Q6:

Which of the following is closest to 5 × 1 0 3 × 6 0 ? Solve without using a calculator.

  • A 3,000
  • B 300,000
  • C 40,000
  • D 30,000

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