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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 429 · 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. 1.69 × 8 =
  2. 2.57 × 8 =
  3. 3.46 × 8 =
  4. 4.125 × 4 =
  5. 5.48 × 8 =
  6. 6.90 × 4 =
  7. 7.148 × 4 =
  8. 8.33 × 4 =
  9. 9.49 × 4 =
  10. 10.74 × 8 =
  11. 11.95 × 4 =
  12. 12.48 × 8 =
  13. 13.140 × 4 =
  14. 14.138 × 4 =
  15. 15.29 × 8 =
  16. 16.21 × 8 =
  17. 17.54 × 8 =
  18. 18.30 × 4 =
  19. 19.122 × 4 =
  20. 20.120 × 4 =
  21. 21.126 × 4 =
  22. 22.111 × 4 =
  23. 23.50 × 8 =
  24. 24.132 × 4 =
  25. 25.26 × 8 =
  26. 26.30 × 4 =
  27. 27.25 × 8 =
  28. 28.54 × 4 =
  29. 29.51 × 8 =
  30. 30.85 × 4 =
  31. 31.117 × 4 =
  32. 32.34 × 8 =
  33. 33.13 × 8 =
  34. 34.39 × 8 =
  35. 35.148 × 4 =
  36. 36.16 × 8 =
  37. 37.13 × 8 =
  38. 38.45 × 4 =
  39. 39.53 × 4 =
  40. 40.96 × 4 =

Answer key

  1. 552
  2. 456
  3. 368
  4. 500
  5. 384
  6. 360
  7. 592
  8. 132
  9. 196
  10. 592
  11. 380
  12. 384
  13. 560
  14. 552
  15. 232
  16. 168
  17. 432
  18. 120
  19. 488
  20. 480
  21. 504
  22. 444
  23. 400
  24. 528
  25. 208
  26. 120
  27. 200
  28. 216
  29. 408
  30. 340
  31. 468
  32. 272
  33. 104
  34. 312
  35. 592
  36. 128
  37. 104
  38. 180
  39. 212
  40. 384

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