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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 185 · 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. 1.43 × 4 =
  2. 2.14 × 8 =
  3. 3.20 × 8 =
  4. 4.70 × 4 =
  5. 5.46 × 4 =
  6. 6.29 × 4 =
  7. 7.60 × 4 =
  8. 8.45 × 4 =
  9. 9.17 × 4 =
  10. 10.66 × 4 =
  11. 11.29 × 8 =
  12. 12.18 × 8 =
  13. 13.27 × 8 =
  14. 14.37 × 4 =
  15. 15.17 × 8 =
  16. 16.73 × 4 =
  17. 17.25 × 4 =
  18. 18.26 × 8 =
  19. 19.36 × 4 =
  20. 20.25 × 8 =
  21. 21.56 × 4 =
  22. 22.32 × 4 =
  23. 23.40 × 4 =
  24. 24.36 × 8 =
  25. 25.39 × 8 =
  26. 26.19 × 8 =
  27. 27.21 × 4 =
  28. 28.30 × 8 =
  29. 29.27 × 4 =
  30. 30.23 × 8 =
  31. 31.47 × 4 =
  32. 32.59 × 4 =
  33. 33.33 × 8 =
  34. 34.16 × 8 =
  35. 35.52 × 4 =
  36. 36.12 × 4 =
  37. 37.39 × 4 =
  38. 38.42 × 4 =
  39. 39.37 × 8 =
  40. 40.34 × 4 =

Answer key

  1. 172
  2. 112
  3. 160
  4. 280
  5. 184
  6. 116
  7. 240
  8. 180
  9. 68
  10. 264
  11. 232
  12. 144
  13. 216
  14. 148
  15. 136
  16. 292
  17. 100
  18. 208
  19. 144
  20. 200
  21. 224
  22. 128
  23. 160
  24. 288
  25. 312
  26. 152
  27. 84
  28. 240
  29. 108
  30. 184
  31. 188
  32. 236
  33. 264
  34. 128
  35. 208
  36. 48
  37. 156
  38. 168
  39. 296
  40. 136

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