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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 845 · 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. 1.21 × 4 =
  2. 2.12 × 4 =
  3. 3.56 × 4 =
  4. 4.23 × 8 =
  5. 5.12 × 8 =
  6. 6.22 × 4 =
  7. 7.37 × 8 =
  8. 8.52 × 4 =
  9. 9.31 × 4 =
  10. 10.29 × 4 =
  11. 11.38 × 4 =
  12. 12.13 × 8 =
  13. 13.21 × 8 =
  14. 14.38 × 8 =
  15. 15.34 × 4 =
  16. 16.28 × 8 =
  17. 17.20 × 4 =
  18. 18.17 × 4 =
  19. 19.14 × 4 =
  20. 20.41 × 4 =
  21. 21.58 × 4 =
  22. 22.20 × 8 =
  23. 23.27 × 4 =
  24. 24.31 × 8 =
  25. 25.32 × 8 =
  26. 26.15 × 8 =
  27. 27.19 × 8 =
  28. 28.22 × 8 =
  29. 29.75 × 4 =
  30. 30.35 × 8 =
  31. 31.61 × 4 =
  32. 32.34 × 8 =
  33. 33.17 × 8 =
  34. 34.36 × 4 =
  35. 35.46 × 4 =
  36. 36.39 × 4 =
  37. 37.72 × 4 =
  38. 38.43 × 4 =
  39. 39.25 × 8 =
  40. 40.16 × 8 =

Answer key

  1. 84
  2. 48
  3. 224
  4. 184
  5. 96
  6. 88
  7. 296
  8. 208
  9. 124
  10. 116
  11. 152
  12. 104
  13. 168
  14. 304
  15. 136
  16. 224
  17. 80
  18. 68
  19. 56
  20. 164
  21. 232
  22. 160
  23. 108
  24. 248
  25. 256
  26. 120
  27. 152
  28. 176
  29. 300
  30. 280
  31. 244
  32. 272
  33. 136
  34. 144
  35. 184
  36. 156
  37. 288
  38. 172
  39. 200
  40. 128

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