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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 601 · 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. 1.29 × 8 =
  2. 2.58 × 4 =
  3. 3.30 × 8 =
  4. 4.34 × 8 =
  5. 5.22 × 8 =
  6. 6.33 × 8 =
  7. 7.39 × 4 =
  8. 8.36 × 8 =
  9. 9.29 × 4 =
  10. 10.19 × 4 =
  11. 11.13 × 4 =
  12. 12.15 × 4 =
  13. 13.17 × 8 =
  14. 14.37 × 8 =
  15. 15.18 × 4 =
  16. 16.15 × 8 =
  17. 17.53 × 4 =
  18. 18.31 × 4 =
  19. 19.27 × 4 =
  20. 20.36 × 4 =
  21. 21.24 × 8 =
  22. 22.32 × 4 =
  23. 23.68 × 4 =
  24. 24.45 × 4 =
  25. 25.51 × 4 =
  26. 26.54 × 4 =
  27. 27.27 × 8 =
  28. 28.41 × 4 =
  29. 29.14 × 8 =
  30. 30.44 × 4 =
  31. 31.18 × 8 =
  32. 32.71 × 4 =
  33. 33.20 × 8 =
  34. 34.25 × 4 =
  35. 35.30 × 4 =
  36. 36.35 × 8 =
  37. 37.16 × 8 =
  38. 38.39 × 8 =
  39. 39.21 × 8 =
  40. 40.23 × 8 =

Answer key

  1. 232
  2. 232
  3. 240
  4. 272
  5. 176
  6. 264
  7. 156
  8. 288
  9. 116
  10. 76
  11. 52
  12. 60
  13. 136
  14. 296
  15. 72
  16. 120
  17. 212
  18. 124
  19. 108
  20. 144
  21. 192
  22. 128
  23. 272
  24. 180
  25. 204
  26. 216
  27. 216
  28. 164
  29. 112
  30. 176
  31. 144
  32. 284
  33. 160
  34. 100
  35. 120
  36. 280
  37. 128
  38. 312
  39. 168
  40. 184

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