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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 439 · 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. 1.40 × 4 =
  2. 2.14 × 4 =
  3. 3.22 × 4 =
  4. 4.30 × 8 =
  5. 5.18 × 8 =
  6. 6.13 × 4 =
  7. 7.32 × 4 =
  8. 8.17 × 8 =
  9. 9.12 × 4 =
  10. 10.35 × 8 =
  11. 11.27 × 4 =
  12. 12.36 × 4 =
  13. 13.32 × 8 =
  14. 14.26 × 8 =
  15. 15.29 × 8 =
  16. 16.12 × 8 =
  17. 17.21 × 4 =
  18. 18.19 × 4 =
  19. 19.68 × 4 =
  20. 20.33 × 8 =
  21. 21.34 × 8 =
  22. 22.23 × 4 =
  23. 23.37 × 8 =
  24. 24.73 × 4 =
  25. 25.22 × 8 =
  26. 26.30 × 4 =
  27. 27.61 × 4 =
  28. 28.24 × 4 =
  29. 29.21 × 8 =
  30. 30.39 × 8 =
  31. 31.28 × 8 =
  32. 32.15 × 8 =
  33. 33.25 × 8 =
  34. 34.72 × 4 =
  35. 35.29 × 4 =
  36. 36.54 × 4 =
  37. 37.16 × 8 =
  38. 38.40 × 8 =
  39. 39.69 × 4 =
  40. 40.27 × 8 =

Answer key

  1. 160
  2. 56
  3. 88
  4. 240
  5. 144
  6. 52
  7. 128
  8. 136
  9. 48
  10. 280
  11. 108
  12. 144
  13. 256
  14. 208
  15. 232
  16. 96
  17. 84
  18. 76
  19. 272
  20. 264
  21. 272
  22. 92
  23. 296
  24. 292
  25. 176
  26. 120
  27. 244
  28. 96
  29. 168
  30. 312
  31. 224
  32. 120
  33. 200
  34. 288
  35. 116
  36. 216
  37. 128
  38. 320
  39. 276
  40. 216

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