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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 362 · 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. 1.50 × 4 =
  2. 2.40 × 4 =
  3. 3.17 × 8 =
  4. 4.29 × 8 =
  5. 5.14 × 8 =
  6. 6.28 × 4 =
  7. 7.64 × 4 =
  8. 8.74 × 4 =
  9. 9.54 × 4 =
  10. 10.38 × 8 =
  11. 11.35 × 8 =
  12. 12.32 × 4 =
  13. 13.15 × 8 =
  14. 14.31 × 4 =
  15. 15.20 × 4 =
  16. 16.30 × 8 =
  17. 17.39 × 8 =
  18. 18.27 × 4 =
  19. 19.33 × 4 =
  20. 20.12 × 4 =
  21. 21.51 × 4 =
  22. 22.32 × 8 =
  23. 23.34 × 8 =
  24. 24.20 × 8 =
  25. 25.15 × 4 =
  26. 26.33 × 8 =
  27. 27.71 × 4 =
  28. 28.24 × 8 =
  29. 29.36 × 8 =
  30. 30.41 × 4 =
  31. 31.30 × 4 =
  32. 32.18 × 4 =
  33. 33.44 × 4 =
  34. 34.21 × 8 =
  35. 35.43 × 4 =
  36. 36.12 × 8 =
  37. 37.35 × 4 =
  38. 38.55 × 4 =
  39. 39.38 × 4 =
  40. 40.39 × 4 =

Answer key

  1. 200
  2. 160
  3. 136
  4. 232
  5. 112
  6. 112
  7. 256
  8. 296
  9. 216
  10. 304
  11. 280
  12. 128
  13. 120
  14. 124
  15. 80
  16. 240
  17. 312
  18. 108
  19. 132
  20. 48
  21. 204
  22. 256
  23. 272
  24. 160
  25. 60
  26. 264
  27. 284
  28. 192
  29. 288
  30. 164
  31. 120
  32. 72
  33. 176
  34. 168
  35. 172
  36. 96
  37. 140
  38. 220
  39. 152
  40. 156

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