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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 179 · 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. 1.21 × 8 =
  2. 2.38 × 8 =
  3. 3.71 × 4 =
  4. 4.47 × 4 =
  5. 5.28 × 8 =
  6. 6.21 × 4 =
  7. 7.27 × 8 =
  8. 8.15 × 8 =
  9. 9.70 × 4 =
  10. 10.32 × 4 =
  11. 11.67 × 4 =
  12. 12.25 × 8 =
  13. 13.66 × 4 =
  14. 14.55 × 4 =
  15. 15.17 × 8 =
  16. 16.35 × 4 =
  17. 17.23 × 4 =
  18. 18.19 × 8 =
  19. 19.39 × 8 =
  20. 20.54 × 4 =
  21. 21.17 × 4 =
  22. 22.74 × 4 =
  23. 23.18 × 4 =
  24. 24.34 × 8 =
  25. 25.26 × 8 =
  26. 26.57 × 4 =
  27. 27.29 × 8 =
  28. 28.69 × 4 =
  29. 29.25 × 4 =
  30. 30.65 × 4 =
  31. 31.60 × 4 =
  32. 32.24 × 8 =
  33. 33.30 × 8 =
  34. 34.37 × 8 =
  35. 35.73 × 4 =
  36. 36.35 × 8 =
  37. 37.12 × 4 =
  38. 38.58 × 4 =
  39. 39.13 × 4 =
  40. 40.12 × 8 =

Answer key

  1. 168
  2. 304
  3. 284
  4. 188
  5. 224
  6. 84
  7. 216
  8. 120
  9. 280
  10. 128
  11. 268
  12. 200
  13. 264
  14. 220
  15. 136
  16. 140
  17. 92
  18. 152
  19. 312
  20. 216
  21. 68
  22. 296
  23. 72
  24. 272
  25. 208
  26. 228
  27. 232
  28. 276
  29. 100
  30. 260
  31. 240
  32. 192
  33. 240
  34. 296
  35. 292
  36. 280
  37. 48
  38. 232
  39. 52
  40. 96

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