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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 29 · 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. 1.87 × 4 =
  2. 2.73 × 4 =
  3. 3.29 × 8 =
  4. 4.61 × 8 =
  5. 5.30 × 4 =
  6. 6.40 × 8 =
  7. 7.64 × 4 =
  8. 8.106 × 4 =
  9. 9.52 × 8 =
  10. 10.25 × 8 =
  11. 11.65 × 8 =
  12. 12.119 × 4 =
  13. 13.59 × 4 =
  14. 14.105 × 4 =
  15. 15.15 × 4 =
  16. 16.65 × 8 =
  17. 17.70 × 8 =
  18. 18.37 × 4 =
  19. 19.25 × 4 =
  20. 20.137 × 4 =
  21. 21.58 × 8 =
  22. 22.53 × 8 =
  23. 23.26 × 4 =
  24. 24.42 × 4 =
  25. 25.58 × 4 =
  26. 26.67 × 4 =
  27. 27.18 × 8 =
  28. 28.62 × 4 =
  29. 29.34 × 4 =
  30. 30.66 × 4 =
  31. 31.88 × 4 =
  32. 32.46 × 4 =
  33. 33.51 × 4 =
  34. 34.32 × 8 =
  35. 35.92 × 4 =
  36. 36.21 × 4 =
  37. 37.31 × 4 =
  38. 38.71 × 8 =
  39. 39.107 × 4 =
  40. 40.26 × 8 =

Answer key

  1. 348
  2. 292
  3. 232
  4. 488
  5. 120
  6. 320
  7. 256
  8. 424
  9. 416
  10. 200
  11. 520
  12. 476
  13. 236
  14. 420
  15. 60
  16. 520
  17. 560
  18. 148
  19. 100
  20. 548
  21. 464
  22. 424
  23. 104
  24. 168
  25. 232
  26. 268
  27. 144
  28. 248
  29. 136
  30. 264
  31. 352
  32. 184
  33. 204
  34. 256
  35. 368
  36. 84
  37. 124
  38. 568
  39. 428
  40. 208

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