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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 910 · 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. 1.39 × 8 =
  2. 2.58 × 8 =
  3. 3.116 × 4 =
  4. 4.63 × 8 =
  5. 5.158 × 4 =
  6. 6.22 × 8 =
  7. 7.66 × 8 =
  8. 8.79 × 4 =
  9. 9.114 × 4 =
  10. 10.56 × 4 =
  11. 11.23 × 8 =
  12. 12.86 × 4 =
  13. 13.122 × 4 =
  14. 14.106 × 4 =
  15. 15.35 × 8 =
  16. 16.103 × 4 =
  17. 17.155 × 4 =
  18. 18.159 × 4 =
  19. 19.73 × 8 =
  20. 20.26 × 8 =
  21. 21.18 × 8 =
  22. 22.70 × 8 =
  23. 23.66 × 8 =
  24. 24.122 × 4 =
  25. 25.13 × 4 =
  26. 26.17 × 8 =
  27. 27.129 × 4 =
  28. 28.53 × 8 =
  29. 29.107 × 4 =
  30. 30.59 × 8 =
  31. 31.75 × 8 =
  32. 32.66 × 4 =
  33. 33.59 × 8 =
  34. 34.29 × 4 =
  35. 35.132 × 4 =
  36. 36.43 × 4 =
  37. 37.30 × 8 =
  38. 38.19 × 8 =
  39. 39.24 × 8 =
  40. 40.21 × 8 =

Answer key

  1. 312
  2. 464
  3. 464
  4. 504
  5. 632
  6. 176
  7. 528
  8. 316
  9. 456
  10. 224
  11. 184
  12. 344
  13. 488
  14. 424
  15. 280
  16. 412
  17. 620
  18. 636
  19. 584
  20. 208
  21. 144
  22. 560
  23. 528
  24. 488
  25. 52
  26. 136
  27. 516
  28. 424
  29. 428
  30. 472
  31. 600
  32. 264
  33. 472
  34. 116
  35. 528
  36. 172
  37. 240
  38. 152
  39. 192
  40. 168

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