Worksheet: Estimating Differences between Three-Digit Numbers: Compatible Numbers

In this worksheet, we will practice using compatible numbers like 25, 50, 75, and 100 to estimate the value of differences with numbers up to 1000.

Q1:

Sophia bought a 373-page notebook for her assignment. She completed her assignment in 127 pages. Use compatible numbers to estimate the number of blank pages that are left in the notebook.

  • A350
  • B300
  • C200
  • D250

Q2:

Use compatible numbers to estimate the following: 526223

  • A200
  • B300
  • C250
  • D350

Q3:

A student used compatible numbers to estimate the result of a subtraction operation, as shown.

What is the actual subtraction operation result?

What is the student’s estimation?

Q4:

A balloon seller was carrying 224 helium balloons. He sold 123 of them. Use compatible numbers to estimate the number of balloons the seller is carrying now.

  • A200
  • B150
  • C100
  • D50

Q5:

A public park has 274 park benches. On Sunday evening, 123 benches were occupied by visitors. Use compatible numbers to estimate the number of benches that were not occupied.

  • A200
  • B100
  • C250
  • D150

Q6:

Madison and Jennifer are playing an online game. Madison scored 498 points and Jennifer scored 377 points. Use compatible numbers to estimate the number of points Madison scored more than Jennifer.

  • A175
  • B125
  • C100
  • D150

Q7:

Natalie has 921 baseball cards. Hannah bought 253 of Natalie’s baseball cards. Use compatible numbers to estimate the number of baseball cards that Natalie has now.

  • A650
  • B675
  • C700
  • D725

Q8:

Use compatible numbers to estimate 527223.

  • A250
  • B350
  • C200
  • D300

Q9:

A country veterinarian treats 306 animals in a month. He nurses pets and farm animals. If he treats 127 pets, use compatible numbers to estimate the number of farm animals he treats in a month.

Q10:

Jacob is reading a chapter book that is 477 pages. He has already read 149 pages. Use compatible numbers to estimate the number of pages that are left for Jacob to read.

  • A300
  • B325
  • C350
  • D375

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