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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 38 · 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. 1.31 × 8 =
  2. 2.49 × 4 =
  3. 3.28 × 8 =
  4. 4.14 × 8 =
  5. 5.19 × 8 =
  6. 6.22 × 4 =
  7. 7.17 × 8 =
  8. 8.16 × 4 =
  9. 9.60 × 4 =
  10. 10.23 × 4 =
  11. 11.42 × 4 =
  12. 12.32 × 8 =
  13. 13.24 × 4 =
  14. 14.18 × 4 =
  15. 15.37 × 8 =
  16. 16.71 × 4 =
  17. 17.20 × 4 =
  18. 18.29 × 8 =
  19. 19.35 × 4 =
  20. 20.16 × 8 =
  21. 21.30 × 8 =
  22. 22.12 × 4 =
  23. 23.41 × 4 =
  24. 24.56 × 4 =
  25. 25.39 × 8 =
  26. 26.68 × 4 =
  27. 27.34 × 8 =
  28. 28.73 × 4 =
  29. 29.61 × 4 =
  30. 30.22 × 8 =
  31. 31.43 × 4 =
  32. 32.33 × 4 =
  33. 33.40 × 8 =
  34. 34.33 × 8 =
  35. 35.14 × 4 =
  36. 36.18 × 8 =
  37. 37.69 × 4 =
  38. 38.62 × 4 =
  39. 39.31 × 4 =
  40. 40.26 × 8 =

Answer key

  1. 248
  2. 196
  3. 224
  4. 112
  5. 152
  6. 88
  7. 136
  8. 64
  9. 240
  10. 92
  11. 168
  12. 256
  13. 96
  14. 72
  15. 296
  16. 284
  17. 80
  18. 232
  19. 140
  20. 128
  21. 240
  22. 48
  23. 164
  24. 224
  25. 312
  26. 272
  27. 272
  28. 292
  29. 244
  30. 176
  31. 172
  32. 132
  33. 320
  34. 264
  35. 56
  36. 144
  37. 276
  38. 248
  39. 124
  40. 208

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