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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 316 · 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. 2.29 × 8 =
  3. 3.37 × 8 =
  4. 4.55 × 4 =
  5. 5.71 × 4 =
  6. 6.42 × 4 =
  7. 7.37 × 4 =
  8. 8.21 × 4 =
  9. 9.64 × 4 =
  10. 10.33 × 8 =
  11. 11.32 × 8 =
  12. 12.75 × 4 =
  13. 13.14 × 4 =
  14. 14.28 × 8 =
  15. 15.29 × 4 =
  16. 16.36 × 8 =
  17. 17.18 × 8 =
  18. 18.51 × 4 =
  19. 19.52 × 4 =
  20. 20.19 × 4 =
  21. 21.31 × 4 =
  22. 22.49 × 4 =
  23. 23.23 × 4 =
  24. 24.15 × 8 =
  25. 25.12 × 4 =
  26. 26.34 × 8 =
  27. 27.16 × 8 =
  28. 28.26 × 8 =
  29. 29.30 × 4 =
  30. 30.39 × 4 =
  31. 31.16 × 4 =
  32. 32.27 × 4 =
  33. 33.74 × 4 =
  34. 34.27 × 8 =
  35. 35.22 × 4 =
  36. 36.50 × 4 =
  37. 37.17 × 4 =
  38. 38.69 × 4 =
  39. 39.73 × 4 =
  40. 40.15 × 4 =

Answer key

  1. 152
  2. 232
  3. 296
  4. 220
  5. 284
  6. 168
  7. 148
  8. 84
  9. 256
  10. 264
  11. 256
  12. 300
  13. 56
  14. 224
  15. 116
  16. 288
  17. 144
  18. 204
  19. 208
  20. 76
  21. 124
  22. 196
  23. 92
  24. 120
  25. 48
  26. 272
  27. 128
  28. 208
  29. 120
  30. 156
  31. 64
  32. 108
  33. 296
  34. 216
  35. 88
  36. 200
  37. 68
  38. 276
  39. 292
  40. 60

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