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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 285 · 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. 1.35 × 4 =
  2. 2.144 × 4 =
  3. 3.73 × 8 =
  4. 4.14 × 4 =
  5. 5.126 × 4 =
  6. 6.145 × 4 =
  7. 7.16 × 8 =
  8. 8.41 × 4 =
  9. 9.14 × 8 =
  10. 10.106 × 4 =
  11. 11.53 × 8 =
  12. 12.47 × 8 =
  13. 13.28 × 4 =
  14. 14.70 × 8 =
  15. 15.30 × 8 =
  16. 16.120 × 4 =
  17. 17.14 × 8 =
  18. 18.55 × 8 =
  19. 19.52 × 4 =
  20. 20.120 × 4 =
  21. 21.45 × 8 =
  22. 22.83 × 4 =
  23. 23.42 × 4 =
  24. 24.156 × 4 =
  25. 25.23 × 8 =
  26. 26.151 × 4 =
  27. 27.28 × 8 =
  28. 28.115 × 4 =
  29. 29.28 × 4 =
  30. 30.29 × 8 =
  31. 31.59 × 8 =
  32. 32.22 × 8 =
  33. 33.31 × 8 =
  34. 34.59 × 8 =
  35. 35.143 × 4 =
  36. 36.28 × 8 =
  37. 37.131 × 4 =
  38. 38.40 × 8 =
  39. 39.14 × 4 =
  40. 40.94 × 4 =

Answer key

  1. 140
  2. 576
  3. 584
  4. 56
  5. 504
  6. 580
  7. 128
  8. 164
  9. 112
  10. 424
  11. 424
  12. 376
  13. 112
  14. 560
  15. 240
  16. 480
  17. 112
  18. 440
  19. 208
  20. 480
  21. 360
  22. 332
  23. 168
  24. 624
  25. 184
  26. 604
  27. 224
  28. 460
  29. 112
  30. 232
  31. 472
  32. 176
  33. 248
  34. 472
  35. 572
  36. 224
  37. 524
  38. 320
  39. 56
  40. 376

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