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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 400 · 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 × 4 =
  2. 2.50 × 8 =
  3. 3.68 × 4 =
  4. 4.51 × 8 =
  5. 5.16 × 8 =
  6. 6.158 × 4 =
  7. 7.54 × 4 =
  8. 8.75 × 8 =
  9. 9.106 × 4 =
  10. 10.62 × 8 =
  11. 11.62 × 4 =
  12. 12.83 × 4 =
  13. 13.142 × 4 =
  14. 14.36 × 4 =
  15. 15.154 × 4 =
  16. 16.40 × 8 =
  17. 17.51 × 8 =
  18. 18.19 × 8 =
  19. 19.74 × 8 =
  20. 20.28 × 8 =
  21. 21.159 × 4 =
  22. 22.18 × 8 =
  23. 23.88 × 4 =
  24. 24.22 × 8 =
  25. 25.81 × 4 =
  26. 26.93 × 4 =
  27. 27.51 × 8 =
  28. 28.44 × 4 =
  29. 29.84 × 4 =
  30. 30.25 × 8 =
  31. 31.63 × 4 =
  32. 32.32 × 8 =
  33. 33.50 × 8 =
  34. 34.55 × 4 =
  35. 35.51 × 8 =
  36. 36.158 × 4 =
  37. 37.117 × 4 =
  38. 38.50 × 8 =
  39. 39.34 × 4 =
  40. 40.64 × 4 =

Answer key

  1. 80
  2. 400
  3. 272
  4. 408
  5. 128
  6. 632
  7. 216
  8. 600
  9. 424
  10. 496
  11. 248
  12. 332
  13. 568
  14. 144
  15. 616
  16. 320
  17. 408
  18. 152
  19. 592
  20. 224
  21. 636
  22. 144
  23. 352
  24. 176
  25. 324
  26. 372
  27. 408
  28. 176
  29. 336
  30. 200
  31. 252
  32. 256
  33. 400
  34. 220
  35. 408
  36. 632
  37. 468
  38. 400
  39. 136
  40. 256

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