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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 818 · 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. 1.102 × 4 =
  2. 2.127 × 4 =
  3. 3.24 × 4 =
  4. 4.123 × 4 =
  5. 5.28 × 8 =
  6. 6.74 × 8 =
  7. 7.79 × 4 =
  8. 8.48 × 4 =
  9. 9.24 × 8 =
  10. 10.37 × 8 =
  11. 11.144 × 4 =
  12. 12.122 × 4 =
  13. 13.60 × 8 =
  14. 14.34 × 8 =
  15. 15.18 × 4 =
  16. 16.40 × 8 =
  17. 17.66 × 8 =
  18. 18.145 × 4 =
  19. 19.32 × 8 =
  20. 20.26 × 8 =
  21. 21.22 × 8 =
  22. 22.53 × 4 =
  23. 23.77 × 4 =
  24. 24.23 × 4 =
  25. 25.91 × 4 =
  26. 26.37 × 8 =
  27. 27.29 × 8 =
  28. 28.17 × 8 =
  29. 29.80 × 4 =
  30. 30.16 × 8 =
  31. 31.65 × 8 =
  32. 32.21 × 8 =
  33. 33.68 × 4 =
  34. 34.78 × 4 =
  35. 35.50 × 8 =
  36. 36.145 × 4 =
  37. 37.63 × 8 =
  38. 38.37 × 8 =
  39. 39.144 × 4 =
  40. 40.84 × 4 =

Answer key

  1. 408
  2. 508
  3. 96
  4. 492
  5. 224
  6. 592
  7. 316
  8. 192
  9. 192
  10. 296
  11. 576
  12. 488
  13. 480
  14. 272
  15. 72
  16. 320
  17. 528
  18. 580
  19. 256
  20. 208
  21. 176
  22. 212
  23. 308
  24. 92
  25. 364
  26. 296
  27. 232
  28. 136
  29. 320
  30. 128
  31. 520
  32. 168
  33. 272
  34. 312
  35. 400
  36. 580
  37. 504
  38. 296
  39. 576
  40. 336

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