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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 242 · 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. 1.28 × 4 =
  2. 2.71 × 4 =
  3. 3.20 × 4 =
  4. 4.29 × 8 =
  5. 5.66 × 4 =
  6. 6.21 × 8 =
  7. 7.32 × 4 =
  8. 8.15 × 8 =
  9. 9.39 × 8 =
  10. 10.20 × 8 =
  11. 11.43 × 4 =
  12. 12.51 × 4 =
  13. 13.21 × 4 =
  14. 14.73 × 4 =
  15. 15.64 × 4 =
  16. 16.37 × 8 =
  17. 17.17 × 4 =
  18. 18.36 × 8 =
  19. 19.63 × 4 =
  20. 20.58 × 4 =
  21. 21.23 × 8 =
  22. 22.48 × 4 =
  23. 23.54 × 4 =
  24. 24.26 × 8 =
  25. 25.12 × 4 =
  26. 26.22 × 8 =
  27. 27.40 × 8 =
  28. 28.26 × 4 =
  29. 29.52 × 4 =
  30. 30.18 × 4 =
  31. 31.33 × 8 =
  32. 32.34 × 4 =
  33. 33.17 × 8 =
  34. 34.35 × 8 =
  35. 35.33 × 4 =
  36. 36.72 × 4 =
  37. 37.24 × 4 =
  38. 38.16 × 8 =
  39. 39.44 × 4 =
  40. 40.18 × 8 =

Answer key

  1. 112
  2. 284
  3. 80
  4. 232
  5. 264
  6. 168
  7. 128
  8. 120
  9. 312
  10. 160
  11. 172
  12. 204
  13. 84
  14. 292
  15. 256
  16. 296
  17. 68
  18. 288
  19. 252
  20. 232
  21. 184
  22. 192
  23. 216
  24. 208
  25. 48
  26. 176
  27. 320
  28. 104
  29. 208
  30. 72
  31. 264
  32. 136
  33. 136
  34. 280
  35. 132
  36. 288
  37. 96
  38. 128
  39. 176
  40. 144

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