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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 318 · 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. 1.71 × 8 =
  2. 2.55 × 4 =
  3. 3.118 × 4 =
  4. 4.39 × 4 =
  5. 5.20 × 8 =
  6. 6.50 × 4 =
  7. 7.74 × 8 =
  8. 8.34 × 4 =
  9. 9.25 × 8 =
  10. 10.143 × 4 =
  11. 11.62 × 8 =
  12. 12.133 × 4 =
  13. 13.57 × 8 =
  14. 14.68 × 4 =
  15. 15.95 × 4 =
  16. 16.143 × 4 =
  17. 17.31 × 4 =
  18. 18.103 × 4 =
  19. 19.63 × 4 =
  20. 20.18 × 8 =
  21. 21.79 × 4 =
  22. 22.154 × 4 =
  23. 23.104 × 4 =
  24. 24.53 × 8 =
  25. 25.35 × 8 =
  26. 26.71 × 8 =
  27. 27.65 × 8 =
  28. 28.63 × 4 =
  29. 29.153 × 4 =
  30. 30.13 × 4 =
  31. 31.46 × 4 =
  32. 32.40 × 8 =
  33. 33.55 × 4 =
  34. 34.19 × 8 =
  35. 35.21 × 8 =
  36. 36.50 × 4 =
  37. 37.15 × 8 =
  38. 38.104 × 4 =
  39. 39.47 × 4 =
  40. 40.146 × 4 =

Answer key

  1. 568
  2. 220
  3. 472
  4. 156
  5. 160
  6. 200
  7. 592
  8. 136
  9. 200
  10. 572
  11. 496
  12. 532
  13. 456
  14. 272
  15. 380
  16. 572
  17. 124
  18. 412
  19. 252
  20. 144
  21. 316
  22. 616
  23. 416
  24. 424
  25. 280
  26. 568
  27. 520
  28. 252
  29. 612
  30. 52
  31. 184
  32. 320
  33. 220
  34. 152
  35. 168
  36. 200
  37. 120
  38. 416
  39. 188
  40. 584

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