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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 249 · 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. 1.89 × 4 =
  2. 2.114 × 4 =
  3. 3.59 × 8 =
  4. 4.107 × 4 =
  5. 5.158 × 4 =
  6. 6.143 × 4 =
  7. 7.68 × 8 =
  8. 8.70 × 8 =
  9. 9.141 × 4 =
  10. 10.19 × 8 =
  11. 11.125 × 4 =
  12. 12.39 × 8 =
  13. 13.95 × 4 =
  14. 14.72 × 4 =
  15. 15.19 × 8 =
  16. 16.71 × 4 =
  17. 17.51 × 8 =
  18. 18.112 × 4 =
  19. 19.48 × 8 =
  20. 20.14 × 8 =
  21. 21.143 × 4 =
  22. 22.119 × 4 =
  23. 23.46 × 4 =
  24. 24.13 × 4 =
  25. 25.42 × 4 =
  26. 26.55 × 4 =
  27. 27.110 × 4 =
  28. 28.50 × 8 =
  29. 29.48 × 4 =
  30. 30.53 × 4 =
  31. 31.105 × 4 =
  32. 32.60 × 8 =
  33. 33.130 × 4 =
  34. 34.150 × 4 =
  35. 35.107 × 4 =
  36. 36.40 × 4 =
  37. 37.25 × 8 =
  38. 38.30 × 4 =
  39. 39.151 × 4 =
  40. 40.46 × 8 =

Answer key

  1. 356
  2. 456
  3. 472
  4. 428
  5. 632
  6. 572
  7. 544
  8. 560
  9. 564
  10. 152
  11. 500
  12. 312
  13. 380
  14. 288
  15. 152
  16. 284
  17. 408
  18. 448
  19. 384
  20. 112
  21. 572
  22. 476
  23. 184
  24. 52
  25. 168
  26. 220
  27. 440
  28. 400
  29. 192
  30. 212
  31. 420
  32. 480
  33. 520
  34. 600
  35. 428
  36. 160
  37. 200
  38. 120
  39. 604
  40. 368

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