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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 178 · 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. 1.70 × 4 =
  2. 2.16 × 4 =
  3. 3.38 × 8 =
  4. 4.39 × 4 =
  5. 5.69 × 4 =
  6. 6.12 × 8 =
  7. 7.55 × 4 =
  8. 8.42 × 4 =
  9. 9.31 × 8 =
  10. 10.14 × 8 =
  11. 11.18 × 4 =
  12. 12.24 × 4 =
  13. 13.47 × 4 =
  14. 14.38 × 4 =
  15. 15.37 × 8 =
  16. 16.33 × 4 =
  17. 17.59 × 4 =
  18. 18.16 × 8 =
  19. 19.24 × 8 =
  20. 20.39 × 8 =
  21. 21.46 × 4 =
  22. 22.17 × 8 =
  23. 23.57 × 4 =
  24. 24.53 × 4 =
  25. 25.34 × 8 =
  26. 26.33 × 8 =
  27. 27.27 × 8 =
  28. 28.40 × 8 =
  29. 29.13 × 4 =
  30. 30.75 × 4 =
  31. 31.74 × 4 =
  32. 32.21 × 8 =
  33. 33.23 × 4 =
  34. 34.41 × 4 =
  35. 35.25 × 8 =
  36. 36.26 × 4 =
  37. 37.32 × 8 =
  38. 38.13 × 8 =
  39. 39.48 × 4 =
  40. 40.62 × 4 =

Answer key

  1. 280
  2. 64
  3. 304
  4. 156
  5. 276
  6. 96
  7. 220
  8. 168
  9. 248
  10. 112
  11. 72
  12. 96
  13. 188
  14. 152
  15. 296
  16. 132
  17. 236
  18. 128
  19. 192
  20. 312
  21. 184
  22. 136
  23. 228
  24. 212
  25. 272
  26. 264
  27. 216
  28. 320
  29. 52
  30. 300
  31. 296
  32. 168
  33. 92
  34. 164
  35. 200
  36. 104
  37. 256
  38. 104
  39. 192
  40. 248

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