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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 398 · 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. 2.21 × 8 =
  3. 3.38 × 8 =
  4. 4.16 × 8 =
  5. 5.34 × 4 =
  6. 6.46 × 4 =
  7. 7.36 × 4 =
  8. 8.31 × 4 =
  9. 9.39 × 4 =
  10. 10.13 × 4 =
  11. 11.28 × 4 =
  12. 12.39 × 8 =
  13. 13.12 × 4 =
  14. 14.65 × 4 =
  15. 15.75 × 4 =
  16. 16.27 × 4 =
  17. 17.13 × 8 =
  18. 18.25 × 4 =
  19. 19.15 × 4 =
  20. 20.37 × 4 =
  21. 21.61 × 4 =
  22. 22.23 × 8 =
  23. 23.25 × 8 =
  24. 24.32 × 8 =
  25. 25.37 × 8 =
  26. 26.30 × 8 =
  27. 27.40 × 4 =
  28. 28.47 × 4 =
  29. 29.24 × 8 =
  30. 30.19 × 8 =
  31. 31.38 × 4 =
  32. 32.14 × 8 =
  33. 33.40 × 8 =
  34. 34.74 × 4 =
  35. 35.18 × 4 =
  36. 36.63 × 4 =
  37. 37.33 × 4 =
  38. 38.29 × 8 =
  39. 39.14 × 4 =
  40. 40.12 × 8 =

Answer key

  1. 180
  2. 168
  3. 304
  4. 128
  5. 136
  6. 184
  7. 144
  8. 124
  9. 156
  10. 52
  11. 112
  12. 312
  13. 48
  14. 260
  15. 300
  16. 108
  17. 104
  18. 100
  19. 60
  20. 148
  21. 244
  22. 184
  23. 200
  24. 256
  25. 296
  26. 240
  27. 160
  28. 188
  29. 192
  30. 152
  31. 152
  32. 112
  33. 320
  34. 296
  35. 72
  36. 252
  37. 132
  38. 232
  39. 56
  40. 96

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