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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 301 · 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. 1.19 × 8 =
  2. 2.38 × 4 =
  3. 3.55 × 4 =
  4. 4.24 × 8 =
  5. 5.17 × 4 =
  6. 6.23 × 4 =
  7. 7.19 × 4 =
  8. 8.25 × 8 =
  9. 9.16 × 4 =
  10. 10.36 × 4 =
  11. 11.42 × 4 =
  12. 12.29 × 8 =
  13. 13.43 × 4 =
  14. 14.16 × 8 =
  15. 15.30 × 4 =
  16. 16.61 × 4 =
  17. 17.70 × 4 =
  18. 18.20 × 8 =
  19. 19.34 × 8 =
  20. 20.14 × 8 =
  21. 21.75 × 4 =
  22. 22.28 × 4 =
  23. 23.30 × 8 =
  24. 24.18 × 4 =
  25. 25.13 × 4 =
  26. 26.13 × 8 =
  27. 27.46 × 4 =
  28. 28.15 × 4 =
  29. 29.40 × 8 =
  30. 30.22 × 8 =
  31. 31.52 × 4 =
  32. 32.39 × 4 =
  33. 33.71 × 4 =
  34. 34.17 × 8 =
  35. 35.56 × 4 =
  36. 36.40 × 4 =
  37. 37.32 × 4 =
  38. 38.38 × 8 =
  39. 39.12 × 4 =
  40. 40.39 × 8 =

Answer key

  1. 152
  2. 152
  3. 220
  4. 192
  5. 68
  6. 92
  7. 76
  8. 200
  9. 64
  10. 144
  11. 168
  12. 232
  13. 172
  14. 128
  15. 120
  16. 244
  17. 280
  18. 160
  19. 272
  20. 112
  21. 300
  22. 112
  23. 240
  24. 72
  25. 52
  26. 104
  27. 184
  28. 60
  29. 320
  30. 176
  31. 208
  32. 156
  33. 284
  34. 136
  35. 224
  36. 160
  37. 128
  38. 304
  39. 48
  40. 312

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