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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 640 · 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. 1.45 × 4 =
  2. 2.40 × 4 =
  3. 3.25 × 8 =
  4. 4.27 × 8 =
  5. 5.19 × 8 =
  6. 6.36 × 4 =
  7. 7.26 × 8 =
  8. 8.14 × 8 =
  9. 9.27 × 4 =
  10. 10.41 × 4 =
  11. 11.20 × 8 =
  12. 12.44 × 4 =
  13. 13.17 × 8 =
  14. 14.22 × 4 =
  15. 15.66 × 4 =
  16. 16.40 × 8 =
  17. 17.31 × 8 =
  18. 18.22 × 8 =
  19. 19.34 × 4 =
  20. 20.61 × 4 =
  21. 21.32 × 8 =
  22. 22.28 × 4 =
  23. 23.68 × 4 =
  24. 24.29 × 4 =
  25. 25.75 × 4 =
  26. 26.34 × 8 =
  27. 27.14 × 4 =
  28. 28.15 × 4 =
  29. 29.26 × 4 =
  30. 30.36 × 8 =
  31. 31.33 × 8 =
  32. 32.13 × 4 =
  33. 33.52 × 4 =
  34. 34.29 × 8 =
  35. 35.55 × 4 =
  36. 36.12 × 4 =
  37. 37.56 × 4 =
  38. 38.39 × 4 =
  39. 39.30 × 8 =
  40. 40.42 × 4 =

Answer key

  1. 180
  2. 160
  3. 200
  4. 216
  5. 152
  6. 144
  7. 208
  8. 112
  9. 108
  10. 164
  11. 160
  12. 176
  13. 136
  14. 88
  15. 264
  16. 320
  17. 248
  18. 176
  19. 136
  20. 244
  21. 256
  22. 112
  23. 272
  24. 116
  25. 300
  26. 272
  27. 56
  28. 60
  29. 104
  30. 288
  31. 264
  32. 52
  33. 208
  34. 232
  35. 220
  36. 48
  37. 224
  38. 156
  39. 240
  40. 168

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