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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 101 · 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. 1.39 × 8 =
  2. 2.23 × 4 =
  3. 3.20 × 8 =
  4. 4.52 × 4 =
  5. 5.63 × 4 =
  6. 6.19 × 4 =
  7. 7.40 × 4 =
  8. 8.47 × 4 =
  9. 9.37 × 4 =
  10. 10.74 × 4 =
  11. 11.24 × 8 =
  12. 12.66 × 4 =
  13. 13.65 × 4 =
  14. 14.37 × 8 =
  15. 15.35 × 8 =
  16. 16.12 × 4 =
  17. 17.28 × 4 =
  18. 18.48 × 4 =
  19. 19.38 × 8 =
  20. 20.16 × 8 =
  21. 21.12 × 8 =
  22. 22.41 × 4 =
  23. 23.27 × 8 =
  24. 24.60 × 4 =
  25. 25.23 × 8 =
  26. 26.15 × 8 =
  27. 27.18 × 8 =
  28. 28.51 × 4 =
  29. 29.21 × 4 =
  30. 30.19 × 8 =
  31. 31.30 × 8 =
  32. 32.31 × 8 =
  33. 33.17 × 8 =
  34. 34.56 × 4 =
  35. 35.36 × 8 =
  36. 36.31 × 4 =
  37. 37.33 × 8 =
  38. 38.32 × 4 =
  39. 39.75 × 4 =
  40. 40.40 × 8 =

Answer key

  1. 312
  2. 92
  3. 160
  4. 208
  5. 252
  6. 76
  7. 160
  8. 188
  9. 148
  10. 296
  11. 192
  12. 264
  13. 260
  14. 296
  15. 280
  16. 48
  17. 112
  18. 192
  19. 304
  20. 128
  21. 96
  22. 164
  23. 216
  24. 240
  25. 184
  26. 120
  27. 144
  28. 204
  29. 84
  30. 152
  31. 240
  32. 248
  33. 136
  34. 224
  35. 288
  36. 124
  37. 264
  38. 128
  39. 300
  40. 320

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