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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 804 · 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. 1.35 × 8 =
  2. 2.48 × 4 =
  3. 3.13 × 8 =
  4. 4.43 × 4 =
  5. 5.16 × 8 =
  6. 6.64 × 4 =
  7. 7.34 × 8 =
  8. 8.36 × 8 =
  9. 9.22 × 8 =
  10. 10.23 × 4 =
  11. 11.33 × 4 =
  12. 12.39 × 8 =
  13. 13.62 × 4 =
  14. 14.19 × 8 =
  15. 15.13 × 4 =
  16. 16.68 × 4 =
  17. 17.26 × 8 =
  18. 18.61 × 4 =
  19. 19.25 × 8 =
  20. 20.38 × 8 =
  21. 21.24 × 4 =
  22. 22.14 × 8 =
  23. 23.40 × 8 =
  24. 24.16 × 4 =
  25. 25.28 × 8 =
  26. 26.37 × 8 =
  27. 27.50 × 4 =
  28. 28.30 × 8 =
  29. 29.31 × 8 =
  30. 30.33 × 8 =
  31. 31.40 × 4 =
  32. 32.15 × 8 =
  33. 33.73 × 4 =
  34. 34.12 × 8 =
  35. 35.30 × 4 =
  36. 36.66 × 4 =
  37. 37.75 × 4 =
  38. 38.54 × 4 =
  39. 39.17 × 8 =
  40. 40.19 × 4 =

Answer key

  1. 280
  2. 192
  3. 104
  4. 172
  5. 128
  6. 256
  7. 272
  8. 288
  9. 176
  10. 92
  11. 132
  12. 312
  13. 248
  14. 152
  15. 52
  16. 272
  17. 208
  18. 244
  19. 200
  20. 304
  21. 96
  22. 112
  23. 320
  24. 64
  25. 224
  26. 296
  27. 200
  28. 240
  29. 248
  30. 264
  31. 160
  32. 120
  33. 292
  34. 96
  35. 120
  36. 264
  37. 300
  38. 216
  39. 136
  40. 76

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