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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 451 · 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. 1.51 × 4 =
  2. 2.40 × 8 =
  3. 3.30 × 4 =
  4. 4.21 × 8 =
  5. 5.21 × 4 =
  6. 6.56 × 4 =
  7. 7.31 × 4 =
  8. 8.13 × 4 =
  9. 9.19 × 8 =
  10. 10.42 × 4 =
  11. 11.32 × 8 =
  12. 12.63 × 4 =
  13. 13.17 × 4 =
  14. 14.19 × 4 =
  15. 15.36 × 8 =
  16. 16.18 × 8 =
  17. 17.36 × 4 =
  18. 18.39 × 8 =
  19. 19.46 × 4 =
  20. 20.33 × 8 =
  21. 21.37 × 8 =
  22. 22.45 × 4 =
  23. 23.35 × 8 =
  24. 24.12 × 4 =
  25. 25.28 × 4 =
  26. 26.30 × 8 =
  27. 27.47 × 4 =
  28. 28.15 × 4 =
  29. 29.31 × 8 =
  30. 30.20 × 4 =
  31. 31.67 × 4 =
  32. 32.52 × 4 =
  33. 33.38 × 8 =
  34. 34.44 × 4 =
  35. 35.32 × 4 =
  36. 36.55 × 4 =
  37. 37.14 × 8 =
  38. 38.43 × 4 =
  39. 39.27 × 8 =
  40. 40.41 × 4 =

Answer key

  1. 204
  2. 320
  3. 120
  4. 168
  5. 84
  6. 224
  7. 124
  8. 52
  9. 152
  10. 168
  11. 256
  12. 252
  13. 68
  14. 76
  15. 288
  16. 144
  17. 144
  18. 312
  19. 184
  20. 264
  21. 296
  22. 180
  23. 280
  24. 48
  25. 112
  26. 240
  27. 188
  28. 60
  29. 248
  30. 80
  31. 268
  32. 208
  33. 304
  34. 176
  35. 128
  36. 220
  37. 112
  38. 172
  39. 216
  40. 164

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