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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 99 · 40 questions
TalentJR

The fast method (Double up): × 4: double, then double again. × 8: double three times. To double a big number, double the tens and the ones separately and add: double 37 = 60 + 14 = 74.

NameDateTime takenScore ___ / 40
  1. 1.72 × 8 =
  2. 2.12 × 8 =
  3. 3.50 × 8 =
  4. 4.41 × 4 =
  5. 5.155 × 4 =
  6. 6.158 × 4 =
  7. 7.23 × 8 =
  8. 8.23 × 8 =
  9. 9.122 × 4 =
  10. 10.38 × 8 =
  11. 11.32 × 8 =
  12. 12.54 × 4 =
  13. 13.52 × 8 =
  14. 14.76 × 4 =
  15. 15.20 × 4 =
  16. 16.93 × 4 =
  17. 17.43 × 4 =
  18. 18.122 × 4 =
  19. 19.51 × 8 =
  20. 20.72 × 4 =
  21. 21.28 × 8 =
  22. 22.70 × 4 =
  23. 23.19 × 8 =
  24. 24.138 × 4 =
  25. 25.74 × 8 =
  26. 26.36 × 8 =
  27. 27.59 × 4 =
  28. 28.57 × 8 =
  29. 29.99 × 4 =
  30. 30.32 × 4 =
  31. 31.152 × 4 =
  32. 32.35 × 4 =
  33. 33.142 × 4 =
  34. 34.19 × 8 =
  35. 35.25 × 4 =
  36. 36.83 × 4 =
  37. 37.59 × 8 =
  38. 38.131 × 4 =
  39. 39.14 × 8 =
  40. 40.72 × 8 =

Answer key

  1. 576
  2. 96
  3. 400
  4. 164
  5. 620
  6. 632
  7. 184
  8. 184
  9. 488
  10. 304
  11. 256
  12. 216
  13. 416
  14. 304
  15. 80
  16. 372
  17. 172
  18. 488
  19. 408
  20. 288
  21. 224
  22. 280
  23. 152
  24. 552
  25. 592
  26. 288
  27. 236
  28. 456
  29. 396
  30. 128
  31. 608
  32. 140
  33. 568
  34. 152
  35. 100
  36. 332
  37. 472
  38. 524
  39. 112
  40. 576

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