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:

Elizabeth 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?

  • A50×55.5
  • B50×5.9
  • C50×0.055
  • D49×0.55
  • E50×0.55

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:

Emma’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?

  • A5×12=60
  • B6×13=78
  • C5×13=65
  • D6×12=72

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.

Q10:

Estimate 73.9×2.1 using compatible numbers.

Hint: What numbers, which you can multiply easily, are close to 73.9 and 2.1?

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