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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 245 · 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. 1.34 × 8 =
  2. 2.33 × 4 =
  3. 3.74 × 4 =
  4. 4.21 × 8 =
  5. 5.62 × 4 =
  6. 6.38 × 8 =
  7. 7.13 × 8 =
  8. 8.17 × 8 =
  9. 9.19 × 4 =
  10. 10.16 × 8 =
  11. 11.32 × 8 =
  12. 12.17 × 4 =
  13. 13.18 × 8 =
  14. 14.58 × 4 =
  15. 15.14 × 8 =
  16. 16.15 × 8 =
  17. 17.67 × 4 =
  18. 18.39 × 8 =
  19. 19.35 × 4 =
  20. 20.20 × 8 =
  21. 21.23 × 4 =
  22. 22.60 × 4 =
  23. 23.33 × 8 =
  24. 24.22 × 4 =
  25. 25.16 × 4 =
  26. 26.66 × 4 =
  27. 27.48 × 4 =
  28. 28.25 × 8 =
  29. 29.30 × 4 =
  30. 30.26 × 8 =
  31. 31.12 × 4 =
  32. 32.40 × 8 =
  33. 33.34 × 4 =
  34. 34.22 × 8 =
  35. 35.12 × 8 =
  36. 36.23 × 8 =
  37. 37.27 × 4 =
  38. 38.35 × 8 =
  39. 39.39 × 4 =
  40. 40.28 × 8 =

Answer key

  1. 272
  2. 132
  3. 296
  4. 168
  5. 248
  6. 304
  7. 104
  8. 136
  9. 76
  10. 128
  11. 256
  12. 68
  13. 144
  14. 232
  15. 112
  16. 120
  17. 268
  18. 312
  19. 140
  20. 160
  21. 92
  22. 240
  23. 264
  24. 88
  25. 64
  26. 264
  27. 192
  28. 200
  29. 120
  30. 208
  31. 48
  32. 320
  33. 136
  34. 176
  35. 96
  36. 184
  37. 108
  38. 280
  39. 156
  40. 224

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