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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 689 · 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 × 4 =
  2. 2.70 × 4 =
  3. 3.14 × 8 =
  4. 4.12 × 4 =
  5. 5.13 × 8 =
  6. 6.30 × 4 =
  7. 7.12 × 8 =
  8. 8.57 × 4 =
  9. 9.31 × 8 =
  10. 10.25 × 8 =
  11. 11.49 × 4 =
  12. 12.19 × 8 =
  13. 13.50 × 4 =
  14. 14.69 × 4 =
  15. 15.35 × 8 =
  16. 16.25 × 4 =
  17. 17.21 × 8 =
  18. 18.42 × 4 =
  19. 19.18 × 8 =
  20. 20.29 × 8 =
  21. 21.52 × 4 =
  22. 22.33 × 8 =
  23. 23.39 × 8 =
  24. 24.23 × 8 =
  25. 25.32 × 8 =
  26. 26.17 × 8 =
  27. 27.62 × 4 =
  28. 28.14 × 4 =
  29. 29.24 × 4 =
  30. 30.15 × 8 =
  31. 31.28 × 4 =
  32. 32.16 × 8 =
  33. 33.38 × 4 =
  34. 34.51 × 4 =
  35. 35.46 × 4 =
  36. 36.45 × 4 =
  37. 37.21 × 4 =
  38. 38.24 × 8 =
  39. 39.31 × 4 =
  40. 40.71 × 4 =

Answer key

  1. 116
  2. 280
  3. 112
  4. 48
  5. 104
  6. 120
  7. 96
  8. 228
  9. 248
  10. 200
  11. 196
  12. 152
  13. 200
  14. 276
  15. 280
  16. 100
  17. 168
  18. 168
  19. 144
  20. 232
  21. 208
  22. 264
  23. 312
  24. 184
  25. 256
  26. 136
  27. 248
  28. 56
  29. 96
  30. 120
  31. 112
  32. 128
  33. 152
  34. 204
  35. 184
  36. 180
  37. 84
  38. 192
  39. 124
  40. 284

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