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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 408 · 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. 1.32 × 8 =
  2. 2.20 × 8 =
  3. 3.40 × 8 =
  4. 4.22 × 8 =
  5. 5.55 × 4 =
  6. 6.66 × 4 =
  7. 7.39 × 8 =
  8. 8.62 × 4 =
  9. 9.15 × 4 =
  10. 10.27 × 8 =
  11. 11.57 × 4 =
  12. 12.19 × 8 =
  13. 13.15 × 8 =
  14. 14.24 × 8 =
  15. 15.36 × 8 =
  16. 16.47 × 4 =
  17. 17.32 × 4 =
  18. 18.27 × 4 =
  19. 19.73 × 4 =
  20. 20.75 × 4 =
  21. 21.17 × 8 =
  22. 22.12 × 8 =
  23. 23.58 × 4 =
  24. 24.33 × 4 =
  25. 25.38 × 4 =
  26. 26.54 × 4 =
  27. 27.44 × 4 =
  28. 28.13 × 8 =
  29. 29.38 × 8 =
  30. 30.59 × 4 =
  31. 31.51 × 4 =
  32. 32.64 × 4 =
  33. 33.37 × 8 =
  34. 34.63 × 4 =
  35. 35.41 × 4 =
  36. 36.72 × 4 =
  37. 37.21 × 8 =
  38. 38.18 × 4 =
  39. 39.67 × 4 =
  40. 40.23 × 8 =

Answer key

  1. 256
  2. 160
  3. 320
  4. 176
  5. 220
  6. 264
  7. 312
  8. 248
  9. 60
  10. 216
  11. 228
  12. 152
  13. 120
  14. 192
  15. 288
  16. 188
  17. 128
  18. 108
  19. 292
  20. 300
  21. 136
  22. 96
  23. 232
  24. 132
  25. 152
  26. 216
  27. 176
  28. 104
  29. 304
  30. 236
  31. 204
  32. 256
  33. 296
  34. 252
  35. 164
  36. 288
  37. 168
  38. 72
  39. 268
  40. 184

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