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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 415 · 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. 1.63 × 4 =
  2. 2.155 × 4 =
  3. 3.32 × 8 =
  4. 4.125 × 4 =
  5. 5.84 × 4 =
  6. 6.13 × 8 =
  7. 7.151 × 4 =
  8. 8.43 × 4 =
  9. 9.100 × 4 =
  10. 10.74 × 8 =
  11. 11.146 × 4 =
  12. 12.57 × 8 =
  13. 13.74 × 8 =
  14. 14.72 × 8 =
  15. 15.49 × 4 =
  16. 16.156 × 4 =
  17. 17.28 × 8 =
  18. 18.51 × 8 =
  19. 19.19 × 4 =
  20. 20.32 × 8 =
  21. 21.44 × 4 =
  22. 22.50 × 4 =
  23. 23.71 × 8 =
  24. 24.72 × 4 =
  25. 25.65 × 8 =
  26. 26.86 × 4 =
  27. 27.19 × 4 =
  28. 28.33 × 4 =
  29. 29.68 × 4 =
  30. 30.69 × 8 =
  31. 31.20 × 4 =
  32. 32.155 × 4 =
  33. 33.14 × 8 =
  34. 34.18 × 4 =
  35. 35.68 × 4 =
  36. 36.23 × 8 =
  37. 37.124 × 4 =
  38. 38.46 × 4 =
  39. 39.125 × 4 =
  40. 40.58 × 4 =

Answer key

  1. 252
  2. 620
  3. 256
  4. 500
  5. 336
  6. 104
  7. 604
  8. 172
  9. 400
  10. 592
  11. 584
  12. 456
  13. 592
  14. 576
  15. 196
  16. 624
  17. 224
  18. 408
  19. 76
  20. 256
  21. 176
  22. 200
  23. 568
  24. 288
  25. 520
  26. 344
  27. 76
  28. 132
  29. 272
  30. 552
  31. 80
  32. 620
  33. 112
  34. 72
  35. 272
  36. 184
  37. 496
  38. 184
  39. 500
  40. 232

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