Worksheet: Estimating the Product of Two Decimals

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

Q1:

Which of the following is the nearest to 5.478×1,080 upon rounding one of the two numbers to either 10, 100, or 1,000?

  • A54.78
  • B547.8
  • C5,478
  • D54,780
  • E547,800

Q2:

Jennifer wants to buy a pair of jeans that cost $49 .99. The sign on the display says that the jeans are 59 off. Which expression can be used to estimate the discount?

  • A 5 0 × 5 5 . 5
  • B 5 0 × 5 . 9
  • C 5 0 × 0 . 0 5 5
  • D 4 9 × 0 . 5 5
  • E 5 0 × 0 . 5 5

Q3:

Which of the following is closest to the result of 27.915×99.06 after rounding one of the two numbers to 10, 100, or 1,000?

  • A2,791.5
  • B279,150
  • C27.915
  • D279.15
  • E27,915

Q4:

Isabella’s shower uses 7.8 liters of water per minute.

By rounding the number of liters to the nearest whole number, estimate how many liters she will use if her shower lasts 9 minutes.

Calculate exactly how many liters of water a 12-minute shower will consume.

Q5:

Use rounding to estimate the amount of money you need to pay for a bag of apples if one kilogram costs $3.05 and the bag holds 7.9 kilograms.

Q6:

An African elephant can travel at a speed of 24.9 kilometers per hour. At this speed, approximately how far could an African elephant travel in 1.5 hours?

Q7:

Which choice provides the closest estimate for 5.67×12.27?

  • A 5 × 1 2 = 6 0
  • B 6 × 1 3 = 7 8
  • C 5 × 1 3 = 6 5
  • D 6 × 1 2 = 7 2

Q8:

Use compatible numbers to estimate the product 26.3×2.8.

Q9:

Estimate 9.85×6.7.

Hint: Round each number to the nearest whole number.

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