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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 640 · 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. 1.49 × 8 =
  2. 2.68 × 4 =
  3. 3.49 × 4 =
  4. 4.18 × 8 =
  5. 5.38 × 8 =
  6. 6.19 × 8 =
  7. 7.47 × 4 =
  8. 8.19 × 4 =
  9. 9.16 × 8 =
  10. 10.24 × 8 =
  11. 11.65 × 4 =
  12. 12.64 × 4 =
  13. 13.51 × 4 =
  14. 14.52 × 8 =
  15. 15.86 × 4 =
  16. 16.56 × 4 =
  17. 17.15 × 4 =
  18. 18.57 × 4 =
  19. 19.63 × 8 =
  20. 20.17 × 8 =
  21. 21.68 × 8 =
  22. 22.18 × 4 =
  23. 23.58 × 8 =
  24. 24.28 × 8 =
  25. 25.66 × 8 =
  26. 26.65 × 8 =
  27. 27.24 × 8 =
  28. 28.41 × 8 =
  29. 29.140 × 4 =
  30. 30.125 × 4 =
  31. 31.68 × 8 =
  32. 32.93 × 4 =
  33. 33.32 × 4 =
  34. 34.129 × 4 =
  35. 35.104 × 4 =
  36. 36.112 × 4 =
  37. 37.19 × 8 =
  38. 38.56 × 4 =
  39. 39.31 × 4 =
  40. 40.137 × 4 =

Answer key

  1. 392
  2. 272
  3. 196
  4. 144
  5. 304
  6. 152
  7. 188
  8. 76
  9. 128
  10. 192
  11. 260
  12. 256
  13. 204
  14. 416
  15. 344
  16. 224
  17. 60
  18. 228
  19. 504
  20. 136
  21. 544
  22. 72
  23. 464
  24. 224
  25. 528
  26. 520
  27. 192
  28. 328
  29. 560
  30. 500
  31. 544
  32. 372
  33. 128
  34. 516
  35. 416
  36. 448
  37. 152
  38. 224
  39. 124
  40. 548

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