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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 529 · 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. 1.31 × 8 =
  2. 2.32 × 4 =
  3. 3.159 × 4 =
  4. 4.13 × 4 =
  5. 5.29 × 8 =
  6. 6.108 × 4 =
  7. 7.138 × 4 =
  8. 8.56 × 4 =
  9. 9.34 × 4 =
  10. 10.17 × 8 =
  11. 11.23 × 8 =
  12. 12.111 × 4 =
  13. 13.19 × 8 =
  14. 14.40 × 8 =
  15. 15.42 × 8 =
  16. 16.68 × 4 =
  17. 17.39 × 8 =
  18. 18.15 × 8 =
  19. 19.54 × 4 =
  20. 20.102 × 4 =
  21. 21.55 × 8 =
  22. 22.25 × 8 =
  23. 23.129 × 4 =
  24. 24.58 × 8 =
  25. 25.50 × 4 =
  26. 26.158 × 4 =
  27. 27.122 × 4 =
  28. 28.143 × 4 =
  29. 29.13 × 8 =
  30. 30.98 × 4 =
  31. 31.32 × 8 =
  32. 32.46 × 8 =
  33. 33.63 × 8 =
  34. 34.39 × 4 =
  35. 35.155 × 4 =
  36. 36.109 × 4 =
  37. 37.23 × 4 =
  38. 38.120 × 4 =
  39. 39.30 × 8 =
  40. 40.107 × 4 =

Answer key

  1. 248
  2. 128
  3. 636
  4. 52
  5. 232
  6. 432
  7. 552
  8. 224
  9. 136
  10. 136
  11. 184
  12. 444
  13. 152
  14. 320
  15. 336
  16. 272
  17. 312
  18. 120
  19. 216
  20. 408
  21. 440
  22. 200
  23. 516
  24. 464
  25. 200
  26. 632
  27. 488
  28. 572
  29. 104
  30. 392
  31. 256
  32. 368
  33. 504
  34. 156
  35. 620
  36. 436
  37. 92
  38. 480
  39. 240
  40. 428

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