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 . 4 7 8 × 1 , 0 8 0 upon rounding one of the two numbers to either 10, 100, or 1 0 0 0 ?

  • A547.8
  • B 54,780
  • C54.78
  • D 5,478
  • E 547,800

Q2:

Engy wants to buy a pair of jeans that cost $49.99. The sign on the display says that the jeans are off. Which expression can be used to estimate the discount?

  • A
  • B
  • C
  • D
  • E

Q3:

Which of the following is closest to the result of 2 8 . 4 2 6 × 9 7 . 5 8 7 5 after rounding one of the two numbers to 10, 100, or 1,000?

  • A284.26
  • B 28,426
  • C28.426
  • D 2,842.6
  • E 284,260

Q4:

The average person blinks about 900 times an hour.

By rounding the number of hours in a day to the nearest ten, estimate how many times a person blinks in a day.

Is this estimate more or less than the actual number of times a person blinks in a day?

  • ALess
  • BMore

Q5:

Nada’s shower uses 7.8 litres of water per minute.

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

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

  • A 93.6 litres
  • B 78.3 litres
  • C 104.4 litres
  • D 70.2 litres
  • E 163.8 litres

Nagwa uses cookies to ensure you get the best experience on our website. Learn more about our Privacy Policy.