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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 605 · 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. 1.15 × 8 =
  2. 2.51 × 4 =
  3. 3.30 × 4 =
  4. 4.64 × 4 =
  5. 5.37 × 4 =
  6. 6.41 × 4 =
  7. 7.33 × 8 =
  8. 8.12 × 8 =
  9. 9.26 × 4 =
  10. 10.14 × 8 =
  11. 11.39 × 8 =
  12. 12.60 × 4 =
  13. 13.26 × 8 =
  14. 14.74 × 4 =
  15. 15.21 × 8 =
  16. 16.16 × 4 =
  17. 17.22 × 4 =
  18. 18.17 × 4 =
  19. 19.13 × 4 =
  20. 20.47 × 4 =
  21. 21.37 × 8 =
  22. 22.38 × 4 =
  23. 23.24 × 8 =
  24. 24.30 × 8 =
  25. 25.14 × 4 =
  26. 26.12 × 4 =
  27. 27.40 × 8 =
  28. 28.17 × 8 =
  29. 29.48 × 4 =
  30. 30.31 × 4 =
  31. 31.68 × 4 =
  32. 32.70 × 4 =
  33. 33.40 × 4 =
  34. 34.16 × 8 =
  35. 35.32 × 4 =
  36. 36.20 × 8 =
  37. 37.19 × 8 =
  38. 38.39 × 4 =
  39. 39.29 × 8 =
  40. 40.22 × 8 =

Answer key

  1. 120
  2. 204
  3. 120
  4. 256
  5. 148
  6. 164
  7. 264
  8. 96
  9. 104
  10. 112
  11. 312
  12. 240
  13. 208
  14. 296
  15. 168
  16. 64
  17. 88
  18. 68
  19. 52
  20. 188
  21. 296
  22. 152
  23. 192
  24. 240
  25. 56
  26. 48
  27. 320
  28. 136
  29. 192
  30. 124
  31. 272
  32. 280
  33. 160
  34. 128
  35. 128
  36. 160
  37. 152
  38. 156
  39. 232
  40. 176

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