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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 617 · 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. 1.40 × 8 =
  2. 2.88 × 4 =
  3. 3.60 × 4 =
  4. 4.146 × 4 =
  5. 5.33 × 8 =
  6. 6.67 × 4 =
  7. 7.50 × 8 =
  8. 8.57 × 4 =
  9. 9.41 × 4 =
  10. 10.18 × 4 =
  11. 11.112 × 4 =
  12. 12.27 × 8 =
  13. 13.32 × 8 =
  14. 14.65 × 8 =
  15. 15.37 × 8 =
  16. 16.44 × 4 =
  17. 17.63 × 8 =
  18. 18.70 × 8 =
  19. 19.136 × 4 =
  20. 20.17 × 8 =
  21. 21.23 × 4 =
  22. 22.53 × 8 =
  23. 23.16 × 4 =
  24. 24.140 × 4 =
  25. 25.76 × 4 =
  26. 26.50 × 8 =
  27. 27.126 × 4 =
  28. 28.134 × 4 =
  29. 29.96 × 4 =
  30. 30.70 × 8 =
  31. 31.40 × 8 =
  32. 32.28 × 4 =
  33. 33.68 × 8 =
  34. 34.65 × 8 =
  35. 35.92 × 4 =
  36. 36.115 × 4 =
  37. 37.90 × 4 =
  38. 38.27 × 8 =
  39. 39.44 × 8 =
  40. 40.138 × 4 =

Answer key

  1. 320
  2. 352
  3. 240
  4. 584
  5. 264
  6. 268
  7. 400
  8. 228
  9. 164
  10. 72
  11. 448
  12. 216
  13. 256
  14. 520
  15. 296
  16. 176
  17. 504
  18. 560
  19. 544
  20. 136
  21. 92
  22. 424
  23. 64
  24. 560
  25. 304
  26. 400
  27. 504
  28. 536
  29. 384
  30. 560
  31. 320
  32. 112
  33. 544
  34. 520
  35. 368
  36. 460
  37. 360
  38. 216
  39. 352
  40. 552

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