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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 501 · 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. 1.20 × 8 =
  2. 2.155 × 4 =
  3. 3.68 × 8 =
  4. 4.140 × 4 =
  5. 5.47 × 8 =
  6. 6.27 × 8 =
  7. 7.20 × 8 =
  8. 8.75 × 8 =
  9. 9.99 × 4 =
  10. 10.16 × 8 =
  11. 11.130 × 4 =
  12. 12.44 × 8 =
  13. 13.69 × 4 =
  14. 14.33 × 8 =
  15. 15.145 × 4 =
  16. 16.33 × 8 =
  17. 17.43 × 4 =
  18. 18.129 × 4 =
  19. 19.64 × 4 =
  20. 20.18 × 8 =
  21. 21.83 × 4 =
  22. 22.52 × 4 =
  23. 23.54 × 8 =
  24. 24.29 × 4 =
  25. 25.125 × 4 =
  26. 26.59 × 8 =
  27. 27.146 × 4 =
  28. 28.61 × 4 =
  29. 29.36 × 8 =
  30. 30.81 × 4 =
  31. 31.78 × 4 =
  32. 32.32 × 8 =
  33. 33.16 × 8 =
  34. 34.72 × 8 =
  35. 35.61 × 4 =
  36. 36.42 × 8 =
  37. 37.96 × 4 =
  38. 38.145 × 4 =
  39. 39.83 × 4 =
  40. 40.29 × 4 =

Answer key

  1. 160
  2. 620
  3. 544
  4. 560
  5. 376
  6. 216
  7. 160
  8. 600
  9. 396
  10. 128
  11. 520
  12. 352
  13. 276
  14. 264
  15. 580
  16. 264
  17. 172
  18. 516
  19. 256
  20. 144
  21. 332
  22. 208
  23. 432
  24. 116
  25. 500
  26. 472
  27. 584
  28. 244
  29. 288
  30. 324
  31. 312
  32. 256
  33. 128
  34. 576
  35. 244
  36. 336
  37. 384
  38. 580
  39. 332
  40. 116

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