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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 470 · 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. 1.15 × 4 =
  2. 2.30 × 4 =
  3. 3.14 × 4 =
  4. 4.20 × 4 =
  5. 5.37 × 8 =
  6. 6.39 × 4 =
  7. 7.62 × 4 =
  8. 8.17 × 4 =
  9. 9.20 × 8 =
  10. 10.64 × 4 =
  11. 11.58 × 4 =
  12. 12.17 × 8 =
  13. 13.27 × 8 =
  14. 14.24 × 8 =
  15. 15.35 × 8 =
  16. 16.34 × 4 =
  17. 17.16 × 4 =
  18. 18.19 × 4 =
  19. 19.29 × 8 =
  20. 20.31 × 8 =
  21. 21.40 × 8 =
  22. 22.50 × 4 =
  23. 23.21 × 4 =
  24. 24.37 × 4 =
  25. 25.21 × 8 =
  26. 26.26 × 8 =
  27. 27.70 × 4 =
  28. 28.36 × 4 =
  29. 29.25 × 8 =
  30. 30.45 × 4 =
  31. 31.43 × 4 =
  32. 32.40 × 4 =
  33. 33.61 × 4 =
  34. 34.29 × 4 =
  35. 35.24 × 4 =
  36. 36.18 × 4 =
  37. 37.13 × 4 =
  38. 38.22 × 8 =
  39. 39.19 × 8 =
  40. 40.23 × 8 =

Answer key

  1. 60
  2. 120
  3. 56
  4. 80
  5. 296
  6. 156
  7. 248
  8. 68
  9. 160
  10. 256
  11. 232
  12. 136
  13. 216
  14. 192
  15. 280
  16. 136
  17. 64
  18. 76
  19. 232
  20. 248
  21. 320
  22. 200
  23. 84
  24. 148
  25. 168
  26. 208
  27. 280
  28. 144
  29. 200
  30. 180
  31. 172
  32. 160
  33. 244
  34. 116
  35. 96
  36. 72
  37. 52
  38. 176
  39. 152
  40. 184

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