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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 734 · 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. 1.50 × 8 =
  2. 2.89 × 4 =
  3. 3.32 × 8 =
  4. 4.16 × 4 =
  5. 5.53 × 4 =
  6. 6.139 × 4 =
  7. 7.73 × 8 =
  8. 8.16 × 8 =
  9. 9.62 × 4 =
  10. 10.24 × 8 =
  11. 11.53 × 8 =
  12. 12.23 × 8 =
  13. 13.17 × 8 =
  14. 14.74 × 4 =
  15. 15.53 × 4 =
  16. 16.72 × 4 =
  17. 17.54 × 8 =
  18. 18.160 × 4 =
  19. 19.146 × 4 =
  20. 20.24 × 8 =
  21. 21.22 × 8 =
  22. 22.24 × 8 =
  23. 23.25 × 4 =
  24. 24.54 × 4 =
  25. 25.34 × 4 =
  26. 26.107 × 4 =
  27. 27.44 × 8 =
  28. 28.87 × 4 =
  29. 29.125 × 4 =
  30. 30.104 × 4 =
  31. 31.41 × 8 =
  32. 32.21 × 8 =
  33. 33.29 × 4 =
  34. 34.61 × 8 =
  35. 35.21 × 8 =
  36. 36.30 × 8 =
  37. 37.113 × 4 =
  38. 38.77 × 4 =
  39. 39.55 × 4 =
  40. 40.76 × 4 =

Answer key

  1. 400
  2. 356
  3. 256
  4. 64
  5. 212
  6. 556
  7. 584
  8. 128
  9. 248
  10. 192
  11. 424
  12. 184
  13. 136
  14. 296
  15. 212
  16. 288
  17. 432
  18. 640
  19. 584
  20. 192
  21. 176
  22. 192
  23. 100
  24. 216
  25. 136
  26. 428
  27. 352
  28. 348
  29. 500
  30. 416
  31. 328
  32. 168
  33. 116
  34. 488
  35. 168
  36. 240
  37. 452
  38. 308
  39. 220
  40. 304

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