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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 142 · 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. 1.16 × 8 =
  2. 2.36 × 8 =
  3. 3.34 × 8 =
  4. 4.66 × 4 =
  5. 5.27 × 8 =
  6. 6.22 × 8 =
  7. 7.12 × 4 =
  8. 8.55 × 4 =
  9. 9.34 × 4 =
  10. 10.63 × 4 =
  11. 11.43 × 4 =
  12. 12.30 × 4 =
  13. 13.14 × 8 =
  14. 14.39 × 8 =
  15. 15.20 × 8 =
  16. 16.33 × 8 =
  17. 17.15 × 8 =
  18. 18.25 × 8 =
  19. 19.13 × 4 =
  20. 20.13 × 8 =
  21. 21.19 × 8 =
  22. 22.31 × 8 =
  23. 23.19 × 4 =
  24. 24.30 × 8 =
  25. 25.35 × 8 =
  26. 26.24 × 8 =
  27. 27.37 × 8 =
  28. 28.54 × 4 =
  29. 29.12 × 8 =
  30. 30.28 × 8 =
  31. 31.21 × 8 =
  32. 32.71 × 4 =
  33. 33.51 × 4 =
  34. 34.70 × 4 =
  35. 35.18 × 4 =
  36. 36.45 × 4 =
  37. 37.32 × 8 =
  38. 38.18 × 8 =
  39. 39.16 × 4 =
  40. 40.26 × 4 =

Answer key

  1. 128
  2. 288
  3. 272
  4. 264
  5. 216
  6. 176
  7. 48
  8. 220
  9. 136
  10. 252
  11. 172
  12. 120
  13. 112
  14. 312
  15. 160
  16. 264
  17. 120
  18. 200
  19. 52
  20. 104
  21. 152
  22. 248
  23. 76
  24. 240
  25. 280
  26. 192
  27. 296
  28. 216
  29. 96
  30. 224
  31. 168
  32. 284
  33. 204
  34. 280
  35. 72
  36. 180
  37. 256
  38. 144
  39. 64
  40. 104

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