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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 446 · 40 questions
TalentJR

How to do it in your head (Double, double, double): × 2: double once. × 4: double, then double again. × 8: double three times.

NameDateTime takenScore ___ / 40
  1. 1.18 × 8 =
  2. 2.29 × 8 =
  3. 3.23 × 8 =
  4. 4.53 × 4 =
  5. 5.40 × 4 =
  6. 6.33 × 8 =
  7. 7.55 × 4 =
  8. 8.19 × 8 =
  9. 9.17 × 8 =
  10. 10.13 × 4 =
  11. 11.27 × 4 =
  12. 12.22 × 8 =
  13. 13.64 × 4 =
  14. 14.39 × 8 =
  15. 15.32 × 8 =
  16. 16.15 × 8 =
  17. 17.31 × 8 =
  18. 18.68 × 4 =
  19. 19.35 × 8 =
  20. 20.74 × 4 =
  21. 21.38 × 8 =
  22. 22.28 × 4 =
  23. 23.21 × 4 =
  24. 24.23 × 4 =
  25. 25.32 × 4 =
  26. 26.60 × 4 =
  27. 27.30 × 4 =
  28. 28.46 × 4 =
  29. 29.62 × 4 =
  30. 30.12 × 8 =
  31. 31.17 × 4 =
  32. 32.50 × 4 =
  33. 33.35 × 4 =
  34. 34.43 × 4 =
  35. 35.39 × 4 =
  36. 36.37 × 4 =
  37. 37.37 × 8 =
  38. 38.38 × 4 =
  39. 39.36 × 4 =
  40. 40.28 × 8 =

Answer key

  1. 144
  2. 232
  3. 184
  4. 212
  5. 160
  6. 264
  7. 220
  8. 152
  9. 136
  10. 52
  11. 108
  12. 176
  13. 256
  14. 312
  15. 256
  16. 120
  17. 248
  18. 272
  19. 280
  20. 296
  21. 304
  22. 112
  23. 84
  24. 92
  25. 128
  26. 240
  27. 120
  28. 184
  29. 248
  30. 96
  31. 68
  32. 200
  33. 140
  34. 172
  35. 156
  36. 148
  37. 296
  38. 152
  39. 144
  40. 224

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