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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 840 · 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. 1.17 × 4 =
  2. 2.16 × 8 =
  3. 3.25 × 8 =
  4. 4.20 × 4 =
  5. 5.47 × 4 =
  6. 6.57 × 4 =
  7. 7.19 × 4 =
  8. 8.26 × 8 =
  9. 9.66 × 4 =
  10. 10.43 × 4 =
  11. 11.30 × 8 =
  12. 12.39 × 4 =
  13. 13.13 × 8 =
  14. 14.38 × 8 =
  15. 15.69 × 4 =
  16. 16.24 × 4 =
  17. 17.27 × 4 =
  18. 18.12 × 8 =
  19. 19.65 × 4 =
  20. 20.54 × 4 =
  21. 21.36 × 8 =
  22. 22.14 × 8 =
  23. 23.21 × 4 =
  24. 24.19 × 8 =
  25. 25.40 × 8 =
  26. 26.29 × 8 =
  27. 27.27 × 8 =
  28. 28.31 × 8 =
  29. 29.59 × 4 =
  30. 30.22 × 4 =
  31. 31.22 × 8 =
  32. 32.16 × 4 =
  33. 33.13 × 4 =
  34. 34.63 × 4 =
  35. 35.46 × 4 =
  36. 36.31 × 4 =
  37. 37.75 × 4 =
  38. 38.33 × 8 =
  39. 39.23 × 8 =
  40. 40.68 × 4 =

Answer key

  1. 68
  2. 128
  3. 200
  4. 80
  5. 188
  6. 228
  7. 76
  8. 208
  9. 264
  10. 172
  11. 240
  12. 156
  13. 104
  14. 304
  15. 276
  16. 96
  17. 108
  18. 96
  19. 260
  20. 216
  21. 288
  22. 112
  23. 84
  24. 152
  25. 320
  26. 232
  27. 216
  28. 248
  29. 236
  30. 88
  31. 176
  32. 64
  33. 52
  34. 252
  35. 184
  36. 124
  37. 300
  38. 264
  39. 184
  40. 272

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