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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 816 · 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. 1.27 × 4 =
  2. 2.16 × 4 =
  3. 3.22 × 4 =
  4. 4.20 × 4 =
  5. 5.28 × 4 =
  6. 6.38 × 8 =
  7. 7.18 × 8 =
  8. 8.36 × 8 =
  9. 9.33 × 4 =
  10. 10.45 × 4 =
  11. 11.19 × 4 =
  12. 12.71 × 4 =
  13. 13.59 × 4 =
  14. 14.18 × 4 =
  15. 15.40 × 8 =
  16. 16.21 × 8 =
  17. 17.26 × 8 =
  18. 18.54 × 4 =
  19. 19.23 × 8 =
  20. 20.17 × 8 =
  21. 21.15 × 4 =
  22. 22.70 × 4 =
  23. 23.41 × 4 =
  24. 24.35 × 4 =
  25. 25.37 × 4 =
  26. 26.26 × 4 =
  27. 27.48 × 4 =
  28. 28.30 × 8 =
  29. 29.30 × 4 =
  30. 30.19 × 8 =
  31. 31.31 × 8 =
  32. 32.28 × 8 =
  33. 33.33 × 8 =
  34. 34.16 × 8 =
  35. 35.13 × 4 =
  36. 36.39 × 8 =
  37. 37.21 × 4 =
  38. 38.27 × 8 =
  39. 39.24 × 8 =
  40. 40.20 × 8 =

Answer key

  1. 108
  2. 64
  3. 88
  4. 80
  5. 112
  6. 304
  7. 144
  8. 288
  9. 132
  10. 180
  11. 76
  12. 284
  13. 236
  14. 72
  15. 320
  16. 168
  17. 208
  18. 216
  19. 184
  20. 136
  21. 60
  22. 280
  23. 164
  24. 140
  25. 148
  26. 104
  27. 192
  28. 240
  29. 120
  30. 152
  31. 248
  32. 224
  33. 264
  34. 128
  35. 52
  36. 312
  37. 84
  38. 216
  39. 192
  40. 160

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