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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 107 · 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. 1.46 × 4 =
  2. 2.40 × 8 =
  3. 3.25 × 8 =
  4. 4.20 × 8 =
  5. 5.23 × 8 =
  6. 6.34 × 4 =
  7. 7.14 × 8 =
  8. 8.54 × 4 =
  9. 9.59 × 4 =
  10. 10.53 × 4 =
  11. 11.22 × 4 =
  12. 12.39 × 8 =
  13. 13.21 × 4 =
  14. 14.73 × 4 =
  15. 15.35 × 4 =
  16. 16.27 × 4 =
  17. 17.15 × 4 =
  18. 18.22 × 8 =
  19. 19.37 × 4 =
  20. 20.32 × 8 =
  21. 21.16 × 8 =
  22. 22.20 × 4 =
  23. 23.30 × 8 =
  24. 24.12 × 8 =
  25. 25.24 × 4 =
  26. 26.71 × 4 =
  27. 27.28 × 8 =
  28. 28.40 × 4 =
  29. 29.26 × 8 =
  30. 30.57 × 4 =
  31. 31.21 × 8 =
  32. 32.33 × 8 =
  33. 33.60 × 4 =
  34. 34.17 × 4 =
  35. 35.42 × 4 =
  36. 36.13 × 8 =
  37. 37.26 × 4 =
  38. 38.29 × 4 =
  39. 39.36 × 8 =
  40. 40.58 × 4 =

Answer key

  1. 184
  2. 320
  3. 200
  4. 160
  5. 184
  6. 136
  7. 112
  8. 216
  9. 236
  10. 212
  11. 88
  12. 312
  13. 84
  14. 292
  15. 140
  16. 108
  17. 60
  18. 176
  19. 148
  20. 256
  21. 128
  22. 80
  23. 240
  24. 96
  25. 96
  26. 284
  27. 224
  28. 160
  29. 208
  30. 228
  31. 168
  32. 264
  33. 240
  34. 68
  35. 168
  36. 104
  37. 104
  38. 116
  39. 288
  40. 232

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