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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 89 · 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. 1.61 × 8 =
  2. 2.118 × 4 =
  3. 3.143 × 4 =
  4. 4.80 × 4 =
  5. 5.134 × 4 =
  6. 6.12 × 8 =
  7. 7.51 × 4 =
  8. 8.36 × 8 =
  9. 9.138 × 4 =
  10. 10.69 × 8 =
  11. 11.134 × 4 =
  12. 12.26 × 4 =
  13. 13.129 × 4 =
  14. 14.59 × 4 =
  15. 15.65 × 8 =
  16. 16.37 × 8 =
  17. 17.61 × 8 =
  18. 18.57 × 4 =
  19. 19.116 × 4 =
  20. 20.14 × 8 =
  21. 21.105 × 4 =
  22. 22.26 × 8 =
  23. 23.84 × 4 =
  24. 24.82 × 4 =
  25. 25.28 × 4 =
  26. 26.38 × 4 =
  27. 27.34 × 4 =
  28. 28.51 × 8 =
  29. 29.72 × 8 =
  30. 30.72 × 8 =
  31. 31.91 × 4 =
  32. 32.90 × 4 =
  33. 33.23 × 4 =
  34. 34.29 × 8 =
  35. 35.50 × 8 =
  36. 36.12 × 8 =
  37. 37.154 × 4 =
  38. 38.75 × 8 =
  39. 39.45 × 4 =
  40. 40.23 × 8 =

Answer key

  1. 488
  2. 472
  3. 572
  4. 320
  5. 536
  6. 96
  7. 204
  8. 288
  9. 552
  10. 552
  11. 536
  12. 104
  13. 516
  14. 236
  15. 520
  16. 296
  17. 488
  18. 228
  19. 464
  20. 112
  21. 420
  22. 208
  23. 336
  24. 328
  25. 112
  26. 152
  27. 136
  28. 408
  29. 576
  30. 576
  31. 364
  32. 360
  33. 92
  34. 232
  35. 400
  36. 96
  37. 616
  38. 600
  39. 180
  40. 184

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