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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 772 · 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. 1.19 × 8 =
  2. 2.35 × 8 =
  3. 3.34 × 4 =
  4. 4.22 × 4 =
  5. 5.38 × 4 =
  6. 6.28 × 4 =
  7. 7.13 × 4 =
  8. 8.60 × 4 =
  9. 9.49 × 4 =
  10. 10.36 × 8 =
  11. 11.24 × 8 =
  12. 12.46 × 4 =
  13. 13.23 × 4 =
  14. 14.14 × 4 =
  15. 15.16 × 8 =
  16. 16.59 × 4 =
  17. 17.30 × 8 =
  18. 18.38 × 8 =
  19. 19.48 × 4 =
  20. 20.21 × 4 =
  21. 21.31 × 8 =
  22. 22.41 × 4 =
  23. 23.32 × 8 =
  24. 24.61 × 4 =
  25. 25.27 × 8 =
  26. 26.53 × 4 =
  27. 27.22 × 8 =
  28. 28.31 × 4 =
  29. 29.20 × 8 =
  30. 30.44 × 4 =
  31. 31.13 × 8 =
  32. 32.18 × 4 =
  33. 33.20 × 4 =
  34. 34.25 × 8 =
  35. 35.39 × 4 =
  36. 36.12 × 4 =
  37. 37.40 × 8 =
  38. 38.33 × 4 =
  39. 39.18 × 8 =
  40. 40.17 × 8 =

Answer key

  1. 152
  2. 280
  3. 136
  4. 88
  5. 152
  6. 112
  7. 52
  8. 240
  9. 196
  10. 288
  11. 192
  12. 184
  13. 92
  14. 56
  15. 128
  16. 236
  17. 240
  18. 304
  19. 192
  20. 84
  21. 248
  22. 164
  23. 256
  24. 244
  25. 216
  26. 212
  27. 176
  28. 124
  29. 160
  30. 176
  31. 104
  32. 72
  33. 80
  34. 200
  35. 156
  36. 48
  37. 320
  38. 132
  39. 144
  40. 136

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