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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 653 · 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. 1.37 × 8 =
  2. 2.17 × 8 =
  3. 3.33 × 8 =
  4. 4.19 × 8 =
  5. 5.15 × 4 =
  6. 6.49 × 4 =
  7. 7.39 × 8 =
  8. 8.42 × 4 =
  9. 9.32 × 4 =
  10. 10.30 × 8 =
  11. 11.69 × 4 =
  12. 12.65 × 4 =
  13. 13.13 × 8 =
  14. 14.58 × 4 =
  15. 15.21 × 8 =
  16. 16.34 × 8 =
  17. 17.38 × 8 =
  18. 18.70 × 4 =
  19. 19.40 × 8 =
  20. 20.74 × 4 =
  21. 21.46 × 4 =
  22. 22.27 × 8 =
  23. 23.14 × 8 =
  24. 24.53 × 4 =
  25. 25.27 × 4 =
  26. 26.36 × 8 =
  27. 27.36 × 4 =
  28. 28.18 × 4 =
  29. 29.23 × 4 =
  30. 30.75 × 4 =
  31. 31.14 × 4 =
  32. 32.22 × 4 =
  33. 33.64 × 4 =
  34. 34.59 × 4 =
  35. 35.37 × 4 =
  36. 36.35 × 8 =
  37. 37.12 × 8 =
  38. 38.66 × 4 =
  39. 39.28 × 8 =
  40. 40.47 × 4 =

Answer key

  1. 296
  2. 136
  3. 264
  4. 152
  5. 60
  6. 196
  7. 312
  8. 168
  9. 128
  10. 240
  11. 276
  12. 260
  13. 104
  14. 232
  15. 168
  16. 272
  17. 304
  18. 280
  19. 320
  20. 296
  21. 184
  22. 216
  23. 112
  24. 212
  25. 108
  26. 288
  27. 144
  28. 72
  29. 92
  30. 300
  31. 56
  32. 88
  33. 256
  34. 236
  35. 148
  36. 280
  37. 96
  38. 264
  39. 224
  40. 188

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