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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 819 · 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. 1.23 × 8 =
  2. 2.29 × 4 =
  3. 3.21 × 8 =
  4. 4.15 × 4 =
  5. 5.22 × 8 =
  6. 6.25 × 8 =
  7. 7.13 × 8 =
  8. 8.19 × 8 =
  9. 9.32 × 4 =
  10. 10.18 × 8 =
  11. 11.29 × 8 =
  12. 12.24 × 8 =
  13. 13.59 × 4 =
  14. 14.40 × 8 =
  15. 15.20 × 8 =
  16. 16.17 × 4 =
  17. 17.12 × 4 =
  18. 18.51 × 4 =
  19. 19.42 × 4 =
  20. 20.12 × 8 =
  21. 21.21 × 4 =
  22. 22.31 × 4 =
  23. 23.47 × 4 =
  24. 24.50 × 4 =
  25. 25.27 × 8 =
  26. 26.39 × 4 =
  27. 27.14 × 8 =
  28. 28.14 × 4 =
  29. 29.26 × 8 =
  30. 30.64 × 4 =
  31. 31.33 × 8 =
  32. 32.40 × 4 =
  33. 33.32 × 8 =
  34. 34.34 × 4 =
  35. 35.71 × 4 =
  36. 36.61 × 4 =
  37. 37.38 × 8 =
  38. 38.16 × 8 =
  39. 39.31 × 8 =
  40. 40.30 × 8 =

Answer key

  1. 184
  2. 116
  3. 168
  4. 60
  5. 176
  6. 200
  7. 104
  8. 152
  9. 128
  10. 144
  11. 232
  12. 192
  13. 236
  14. 320
  15. 160
  16. 68
  17. 48
  18. 204
  19. 168
  20. 96
  21. 84
  22. 124
  23. 188
  24. 200
  25. 216
  26. 156
  27. 112
  28. 56
  29. 208
  30. 256
  31. 264
  32. 160
  33. 256
  34. 136
  35. 284
  36. 244
  37. 304
  38. 128
  39. 248
  40. 240

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