Multiplying by Tens · seed 1 · A4, ink-friendly. The answer key prints on its own page for grown-ups.

Multiplying by Tens

Mathematics · Multiplication & Division · ages 8-9
Name ______________________   Date ____________

  1. What is 6 × 30?

    • 18
    • 180
    • 1800

  2. Zac says 3 x 40 is ten times bigger than 3 x 4. Is Zac right?

    Circle one:   True   False

  3. Which sentence explains why 6 x 50 ends in a zero?

    • 50 is 5 tens, so 6 x 5 tens = 30 tens = 300
    • 50 has a zero so you write a zero
    • 6 + 50 = 56
    • 5 x 6 = 30

  4. What is 5 × 20?

    • 10
    • 100
    • 500

  5. Estimate 48 x 52 by rounding both numbers first.

    • About 2500
    • About 100
    • About 1000
    • About 10000

  6. Which is the best quick estimate for 6 × 89?

    • 6 × 90 = 540
    • 6 × 9 = 54
    • 6 × 8 = 48

  7. What is 8 x 60?

    Answer: ______________

  8. Which shows the fastest way to solve 7 × 60?

    • 7 × 6 = 42, then add a zero: 420
    • 7 + 60 = 67
    • 7 × 6 = 42, so the answer is 42

  9. Jake computed 8 × 30 and wrote 24. What mistake did he make?

    • He multiplied 8 × 3 wrong
    • He used the wrong digit
    • He forgot to add the zero for the ten

  10. Round 41 to the nearest ten. Then use that to estimate 7 × 41.

    Answer: ______________

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Answer key

For grown-ups. Fold this page away before handing over the rest.

Multiplying by Tens W1-mt_isojCL9yy--s1

  1. 180 · 6 × 3 = 18, and 30 is 3 tens, so the answer is 18 tens, which is 180.
  2. True · 40 is ten times 4, so the product grows ten times: 120 instead of 12.
  3. 50 is 5 tens, so 6 x 5 tens = 30 tens = 300 · 50 means 5 tens, and 6 lots of 5 tens is 30 tens, which is 300.
  4. 100 · 5 × 2 = 10, and 20 is 2 tens, so the answer is 10 tens, which is 100.
  5. About 2500 · 48 rounds to 50 and 52 rounds to 50: 50 x 50 = 2500.
  6. 6 × 90 = 540 · Round 89 to 90 first. Then 6 × 9 = 54, and adding a zero gives 540.
  7. 480 · 8 x 6 = 48, and 48 tens is 480.
  8. 7 × 6 = 42, then add a zero: 420 · The digit fact gives 42. Since 60 is 6 tens, add one zero to get 420.
  9. He forgot to add the zero for the ten · 8 × 3 = 24 is correct, but 30 is 3 tens, so Jake needed to add a zero. The real answer is 240.
  10. 280 · 41 rounds to 40. Then 7 × 4 = 28, so 7 × 40 = 280 is a good quick estimate.
Worksheet · LightMySky