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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 138 · 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. 1.98 × 4 =
  2. 2.118 × 4 =
  3. 3.68 × 8 =
  4. 4.16 × 8 =
  5. 5.21 × 8 =
  6. 6.123 × 4 =
  7. 7.64 × 8 =
  8. 8.67 × 8 =
  9. 9.77 × 4 =
  10. 10.99 × 4 =
  11. 11.103 × 4 =
  12. 12.44 × 4 =
  13. 13.53 × 4 =
  14. 14.30 × 8 =
  15. 15.148 × 4 =
  16. 16.33 × 8 =
  17. 17.34 × 4 =
  18. 18.45 × 8 =
  19. 19.24 × 8 =
  20. 20.45 × 8 =
  21. 21.16 × 8 =
  22. 22.56 × 8 =
  23. 23.41 × 4 =
  24. 24.35 × 8 =
  25. 25.15 × 8 =
  26. 26.128 × 4 =
  27. 27.29 × 4 =
  28. 28.74 × 4 =
  29. 29.37 × 4 =
  30. 30.130 × 4 =
  31. 31.13 × 4 =
  32. 32.24 × 4 =
  33. 33.151 × 4 =
  34. 34.30 × 8 =
  35. 35.80 × 4 =
  36. 36.75 × 8 =
  37. 37.59 × 4 =
  38. 38.61 × 8 =
  39. 39.159 × 4 =
  40. 40.28 × 4 =

Answer key

  1. 392
  2. 472
  3. 544
  4. 128
  5. 168
  6. 492
  7. 512
  8. 536
  9. 308
  10. 396
  11. 412
  12. 176
  13. 212
  14. 240
  15. 592
  16. 264
  17. 136
  18. 360
  19. 192
  20. 360
  21. 128
  22. 448
  23. 164
  24. 280
  25. 120
  26. 512
  27. 116
  28. 296
  29. 148
  30. 520
  31. 52
  32. 96
  33. 604
  34. 240
  35. 320
  36. 600
  37. 236
  38. 488
  39. 636
  40. 112

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