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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 328 · 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. 1.115 × 4 =
  2. 2.128 × 4 =
  3. 3.71 × 4 =
  4. 4.145 × 4 =
  5. 5.22 × 8 =
  6. 6.76 × 4 =
  7. 7.25 × 4 =
  8. 8.123 × 4 =
  9. 9.120 × 4 =
  10. 10.58 × 4 =
  11. 11.30 × 8 =
  12. 12.104 × 4 =
  13. 13.42 × 4 =
  14. 14.91 × 4 =
  15. 15.71 × 8 =
  16. 16.14 × 8 =
  17. 17.74 × 8 =
  18. 18.50 × 8 =
  19. 19.55 × 8 =
  20. 20.38 × 8 =
  21. 21.106 × 4 =
  22. 22.140 × 4 =
  23. 23.88 × 4 =
  24. 24.56 × 8 =
  25. 25.28 × 4 =
  26. 26.18 × 8 =
  27. 27.22 × 8 =
  28. 28.52 × 8 =
  29. 29.50 × 4 =
  30. 30.61 × 4 =
  31. 31.111 × 4 =
  32. 32.67 × 4 =
  33. 33.71 × 4 =
  34. 34.107 × 4 =
  35. 35.28 × 4 =
  36. 36.35 × 4 =
  37. 37.26 × 4 =
  38. 38.73 × 8 =
  39. 39.68 × 8 =
  40. 40.25 × 4 =

Answer key

  1. 460
  2. 512
  3. 284
  4. 580
  5. 176
  6. 304
  7. 100
  8. 492
  9. 480
  10. 232
  11. 240
  12. 416
  13. 168
  14. 364
  15. 568
  16. 112
  17. 592
  18. 400
  19. 440
  20. 304
  21. 424
  22. 560
  23. 352
  24. 448
  25. 112
  26. 144
  27. 176
  28. 416
  29. 200
  30. 244
  31. 444
  32. 268
  33. 284
  34. 428
  35. 112
  36. 140
  37. 104
  38. 584
  39. 544
  40. 100

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