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Worksheet: Estimating Sums and Differences of Mixed Numbers

Q1:

By rounding each fraction to the nearest whole number, estimate the sum of 3 1 3 , 4 1 1 2 , and 9 8 1 1 .

  • A18
  • B16
  • C19
  • D17

Q2:

By rounding each term to a whole number, estimate 7 2 3 + 4 1 1 2 .

Q3:

Olivia had a piece of cloth that was 2 0 2 7 inches long. She shortened its length by 4 2 5 inches. Estimate the new length of the piece of cloth.

Q4:

Noah ran two miles. He ran the first mile in 5 7 1 0 minutes and the second mile in 6 1 3 minutes. By rounding each fraction to a whole number, estimate the time it took Noah to run the two miles.

  • A 13 min
  • B 11 min
  • C 10 min
  • D 12 min
  • E 14 min

Q5:

David ran two miles. He ran the first mile in 5 1 2 minutes and the second mile in 6 1 4 minutes. By rounding each fraction to a whole number, estimate the time it took David to run the two miles.

  • A 13 min
  • B 11 min
  • C 10 min
  • D 12 min
  • E 14 min

Q6:

Chloe has saved $ 4 2 7 9 to pay for a vacation. She spends $ 1 1 1 5 on a hotel and $978 on flights.

First, estimate the amount she has left by rounding each number to the nearest hundred.

  • A $ 1 2 0 0
  • B $ 2 1 0 0
  • C $ 2 0 0 0
  • D $ 2 2 0 0
  • E $ 2 3 0 0

Find the exact answer. Use your estimate to check if your answer is reasonable.

  • A $ 2 1 8 6
  • B $ 2 2 0 1
  • C $ 2 1 7 9
  • D $ 2 1 6 8
  • E $ 2 1 6 4