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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 496 · 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. 1.70 × 4 =
  2. 2.125 × 4 =
  3. 3.46 × 8 =
  4. 4.22 × 4 =
  5. 5.74 × 8 =
  6. 6.113 × 4 =
  7. 7.25 × 4 =
  8. 8.18 × 4 =
  9. 9.95 × 4 =
  10. 10.71 × 4 =
  11. 11.33 × 4 =
  12. 12.60 × 8 =
  13. 13.33 × 4 =
  14. 14.69 × 8 =
  15. 15.71 × 8 =
  16. 16.42 × 4 =
  17. 17.119 × 4 =
  18. 18.57 × 8 =
  19. 19.128 × 4 =
  20. 20.65 × 4 =
  21. 21.57 × 8 =
  22. 22.74 × 8 =
  23. 23.31 × 4 =
  24. 24.71 × 8 =
  25. 25.50 × 4 =
  26. 26.16 × 8 =
  27. 27.72 × 8 =
  28. 28.12 × 8 =
  29. 29.19 × 8 =
  30. 30.102 × 4 =
  31. 31.123 × 4 =
  32. 32.64 × 8 =
  33. 33.18 × 8 =
  34. 34.21 × 8 =
  35. 35.62 × 8 =
  36. 36.56 × 8 =
  37. 37.143 × 4 =
  38. 38.68 × 4 =
  39. 39.69 × 8 =
  40. 40.152 × 4 =

Answer key

  1. 280
  2. 500
  3. 368
  4. 88
  5. 592
  6. 452
  7. 100
  8. 72
  9. 380
  10. 284
  11. 132
  12. 480
  13. 132
  14. 552
  15. 568
  16. 168
  17. 476
  18. 456
  19. 512
  20. 260
  21. 456
  22. 592
  23. 124
  24. 568
  25. 200
  26. 128
  27. 576
  28. 96
  29. 152
  30. 408
  31. 492
  32. 512
  33. 144
  34. 168
  35. 496
  36. 448
  37. 572
  38. 272
  39. 552
  40. 608

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