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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 8 · 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. 1.89 × 4 =
  2. 2.70 × 4 =
  3. 3.42 × 4 =
  4. 4.76 × 4 =
  5. 5.38 × 4 =
  6. 6.27 × 4 =
  7. 7.13 × 8 =
  8. 8.153 × 4 =
  9. 9.53 × 8 =
  10. 10.28 × 8 =
  11. 11.51 × 8 =
  12. 12.135 × 4 =
  13. 13.55 × 4 =
  14. 14.58 × 8 =
  15. 15.130 × 4 =
  16. 16.38 × 4 =
  17. 17.44 × 4 =
  18. 18.50 × 4 =
  19. 19.120 × 4 =
  20. 20.109 × 4 =
  21. 21.30 × 8 =
  22. 22.49 × 8 =
  23. 23.30 × 4 =
  24. 24.34 × 4 =
  25. 25.122 × 4 =
  26. 26.69 × 8 =
  27. 27.43 × 8 =
  28. 28.42 × 8 =
  29. 29.35 × 4 =
  30. 30.59 × 8 =
  31. 31.41 × 4 =
  32. 32.126 × 4 =
  33. 33.55 × 8 =
  34. 34.99 × 4 =
  35. 35.144 × 4 =
  36. 36.124 × 4 =
  37. 37.16 × 8 =
  38. 38.36 × 4 =
  39. 39.40 × 4 =
  40. 40.37 × 4 =

Answer key

  1. 356
  2. 280
  3. 168
  4. 304
  5. 152
  6. 108
  7. 104
  8. 612
  9. 424
  10. 224
  11. 408
  12. 540
  13. 220
  14. 464
  15. 520
  16. 152
  17. 176
  18. 200
  19. 480
  20. 436
  21. 240
  22. 392
  23. 120
  24. 136
  25. 488
  26. 552
  27. 344
  28. 336
  29. 140
  30. 472
  31. 164
  32. 504
  33. 440
  34. 396
  35. 576
  36. 496
  37. 128
  38. 144
  39. 160
  40. 148

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