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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 538 · 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. 1.45 × 4 =
  2. 2.61 × 4 =
  3. 3.70 × 4 =
  4. 4.58 × 4 =
  5. 5.32 × 8 =
  6. 6.21 × 4 =
  7. 7.38 × 4 =
  8. 8.20 × 8 =
  9. 9.32 × 4 =
  10. 10.34 × 4 =
  11. 11.51 × 4 =
  12. 12.15 × 8 =
  13. 13.39 × 4 =
  14. 14.16 × 8 =
  15. 15.22 × 8 =
  16. 16.13 × 8 =
  17. 17.23 × 4 =
  18. 18.36 × 4 =
  19. 19.46 × 4 =
  20. 20.12 × 8 =
  21. 21.15 × 4 =
  22. 22.25 × 8 =
  23. 23.63 × 4 =
  24. 24.68 × 4 =
  25. 25.30 × 8 =
  26. 26.33 × 8 =
  27. 27.36 × 8 =
  28. 28.37 × 8 =
  29. 29.18 × 8 =
  30. 30.26 × 4 =
  31. 31.28 × 4 =
  32. 32.13 × 4 =
  33. 33.29 × 8 =
  34. 34.25 × 4 =
  35. 35.39 × 8 =
  36. 36.31 × 8 =
  37. 37.69 × 4 =
  38. 38.66 × 4 =
  39. 39.31 × 4 =
  40. 40.19 × 8 =

Answer key

  1. 180
  2. 244
  3. 280
  4. 232
  5. 256
  6. 84
  7. 152
  8. 160
  9. 128
  10. 136
  11. 204
  12. 120
  13. 156
  14. 128
  15. 176
  16. 104
  17. 92
  18. 144
  19. 184
  20. 96
  21. 60
  22. 200
  23. 252
  24. 272
  25. 240
  26. 264
  27. 288
  28. 296
  29. 144
  30. 104
  31. 112
  32. 52
  33. 232
  34. 100
  35. 312
  36. 248
  37. 276
  38. 264
  39. 124
  40. 152

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