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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 511 · 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. 1.63 × 4 =
  2. 2.26 × 8 =
  3. 3.20 × 8 =
  4. 4.30 × 8 =
  5. 5.45 × 4 =
  6. 6.49 × 4 =
  7. 7.35 × 4 =
  8. 8.66 × 4 =
  9. 9.13 × 4 =
  10. 10.17 × 4 =
  11. 11.12 × 8 =
  12. 12.35 × 8 =
  13. 13.29 × 8 =
  14. 14.47 × 4 =
  15. 15.71 × 4 =
  16. 16.67 × 4 =
  17. 17.31 × 4 =
  18. 18.39 × 4 =
  19. 19.18 × 4 =
  20. 20.51 × 4 =
  21. 21.23 × 8 =
  22. 22.46 × 4 =
  23. 23.40 × 8 =
  24. 24.37 × 8 =
  25. 25.12 × 4 =
  26. 26.44 × 4 =
  27. 27.32 × 8 =
  28. 28.17 × 8 =
  29. 29.14 × 4 =
  30. 30.36 × 8 =
  31. 31.25 × 4 =
  32. 32.52 × 4 =
  33. 33.42 × 4 =
  34. 34.15 × 8 =
  35. 35.14 × 8 =
  36. 36.27 × 8 =
  37. 37.22 × 8 =
  38. 38.56 × 4 =
  39. 39.19 × 8 =
  40. 40.30 × 4 =

Answer key

  1. 252
  2. 208
  3. 160
  4. 240
  5. 180
  6. 196
  7. 140
  8. 264
  9. 52
  10. 68
  11. 96
  12. 280
  13. 232
  14. 188
  15. 284
  16. 268
  17. 124
  18. 156
  19. 72
  20. 204
  21. 184
  22. 184
  23. 320
  24. 296
  25. 48
  26. 176
  27. 256
  28. 136
  29. 56
  30. 288
  31. 100
  32. 208
  33. 168
  34. 120
  35. 112
  36. 216
  37. 176
  38. 224
  39. 152
  40. 120

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