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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 807 · 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. 1.34 × 4 =
  2. 2.37 × 4 =
  3. 3.18 × 8 =
  4. 4.40 × 8 =
  5. 5.25 × 8 =
  6. 6.39 × 8 =
  7. 7.68 × 4 =
  8. 8.22 × 4 =
  9. 9.19 × 8 =
  10. 10.38 × 8 =
  11. 11.21 × 4 =
  12. 12.53 × 4 =
  13. 13.26 × 4 =
  14. 14.15 × 8 =
  15. 15.12 × 8 =
  16. 16.20 × 8 =
  17. 17.31 × 4 =
  18. 18.28 × 8 =
  19. 19.13 × 4 =
  20. 20.30 × 8 =
  21. 21.36 × 4 =
  22. 22.28 × 4 =
  23. 23.24 × 8 =
  24. 24.48 × 4 =
  25. 25.51 × 4 =
  26. 26.22 × 8 =
  27. 27.44 × 4 =
  28. 28.71 × 4 =
  29. 29.26 × 8 =
  30. 30.34 × 8 =
  31. 31.21 × 8 =
  32. 32.70 × 4 =
  33. 33.37 × 8 =
  34. 34.31 × 8 =
  35. 35.38 × 4 =
  36. 36.46 × 4 =
  37. 37.13 × 8 =
  38. 38.16 × 4 =
  39. 39.66 × 4 =
  40. 40.12 × 4 =

Answer key

  1. 136
  2. 148
  3. 144
  4. 320
  5. 200
  6. 312
  7. 272
  8. 88
  9. 152
  10. 304
  11. 84
  12. 212
  13. 104
  14. 120
  15. 96
  16. 160
  17. 124
  18. 224
  19. 52
  20. 240
  21. 144
  22. 112
  23. 192
  24. 192
  25. 204
  26. 176
  27. 176
  28. 284
  29. 208
  30. 272
  31. 168
  32. 280
  33. 296
  34. 248
  35. 152
  36. 184
  37. 104
  38. 64
  39. 264
  40. 48

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