Worksheet: Estimating Products: Multiplying by One-Digit Numbers

In this worksheet, we will practice estimating the products of one-digit numbers and two- or three-digit numbers by rounding to the nearest ten or hundred.

Q1:

We can estimate to check our work.

Estimate 83×4 by rounding 83 to the nearest ten.

Find the product.

Check that your answer is reasonable using your estimate.

Q2:

Look at how Chloe estimated the product by rounding the three-digit number to the nearest hundred.

Use her method to estimate 792×5.

Use her method to estimate 253×9.

Q3:

We can estimate to check our work.

Estimate 269×6 by rounding 269 to the nearest hundred.

Find the product.

Check that your answer is reasonable using your estimate.

Q4:

An amphitheater has 47 rows. Each row seats 7 spectators. Estimate the total capacity of the amphitheater to the nearest ten.

Q5:

Sophia is estimating the result of 47×3 by rounding both factors to the nearest ten.

Fill in the blank: she finds that the exact answer is between ×3 and ×3.

  • A40, 50
  • B20, 30
  • C30, 40
  • D60, 70
  • E50, 60

State the two numbers that the exact answer is between.

  • A120 and 150
  • B47 and 3
  • C30 and 50
  • D40 and 60
  • E40 and 50

Which of the two numbers is the exact answer closer to?

Q6:

In one day, Jackson can decorate 17 cakes and Madison can decorate 19.

Pick the best estimate for the number of cakes they can decorate in 5 days.

  • A200
  • B100
  • C300
  • D80
  • E30

Q7:

Which product gives an estimate of 140 when one of the multiplied numbers is rounded to the nearest 10?

  • A74×3
  • B64×3
  • C76×3
  • D74×2
  • E76×2

Q8:

A teacher asked their students to estimate the product of 36×3. Ethan got 120, whereas Charlotte got 90. Estimate the product yourself and decide which student is correct.

  • AEthan
  • BCharlotte

Q9:

Which product gives an estimate of 600 when one of the multiplied numbers is rounded to the nearest 100?

  • A256×2
  • B246×4
  • C256×3
  • D156×2
  • E246×2

Q10:

Olivia needed to find the result of 329×3. She rounded the first factor the nearest 100 to estimate the product and got 900. Was she correct?

  • ANo
  • BYes

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