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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 129 · 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. 1.20 × 8 =
  2. 2.70 × 4 =
  3. 3.20 × 4 =
  4. 4.12 × 8 =
  5. 5.56 × 4 =
  6. 6.16 × 8 =
  7. 7.18 × 4 =
  8. 8.12 × 4 =
  9. 9.34 × 8 =
  10. 10.35 × 8 =
  11. 11.60 × 4 =
  12. 12.32 × 4 =
  13. 13.73 × 4 =
  14. 14.29 × 4 =
  15. 15.39 × 8 =
  16. 16.38 × 8 =
  17. 17.16 × 4 =
  18. 18.18 × 8 =
  19. 19.39 × 4 =
  20. 20.71 × 4 =
  21. 21.22 × 8 =
  22. 22.65 × 4 =
  23. 23.40 × 8 =
  24. 24.25 × 8 =
  25. 25.37 × 4 =
  26. 26.24 × 4 =
  27. 27.36 × 4 =
  28. 28.26 × 8 =
  29. 29.41 × 4 =
  30. 30.62 × 4 =
  31. 31.59 × 4 =
  32. 32.19 × 8 =
  33. 33.28 × 8 =
  34. 34.29 × 8 =
  35. 35.42 × 4 =
  36. 36.28 × 4 =
  37. 37.15 × 8 =
  38. 38.23 × 8 =
  39. 39.15 × 4 =
  40. 40.47 × 4 =

Answer key

  1. 160
  2. 280
  3. 80
  4. 96
  5. 224
  6. 128
  7. 72
  8. 48
  9. 272
  10. 280
  11. 240
  12. 128
  13. 292
  14. 116
  15. 312
  16. 304
  17. 64
  18. 144
  19. 156
  20. 284
  21. 176
  22. 260
  23. 320
  24. 200
  25. 148
  26. 96
  27. 144
  28. 208
  29. 164
  30. 248
  31. 236
  32. 152
  33. 224
  34. 232
  35. 168
  36. 112
  37. 120
  38. 184
  39. 60
  40. 188

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