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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 241 · 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. 1.75 × 4 =
  2. 2.37 × 4 =
  3. 3.20 × 8 =
  4. 4.14 × 8 =
  5. 5.61 × 4 =
  6. 6.32 × 8 =
  7. 7.17 × 8 =
  8. 8.23 × 8 =
  9. 9.25 × 8 =
  10. 10.68 × 4 =
  11. 11.47 × 4 =
  12. 12.27 × 8 =
  13. 13.48 × 4 =
  14. 14.26 × 8 =
  15. 15.30 × 8 =
  16. 16.38 × 4 =
  17. 17.35 × 8 =
  18. 18.15 × 8 =
  19. 19.31 × 4 =
  20. 20.18 × 4 =
  21. 21.36 × 8 =
  22. 22.44 × 4 =
  23. 23.20 × 4 =
  24. 24.26 × 4 =
  25. 25.62 × 4 =
  26. 26.70 × 4 =
  27. 27.34 × 8 =
  28. 28.66 × 4 =
  29. 29.29 × 4 =
  30. 30.39 × 4 =
  31. 31.60 × 4 =
  32. 32.22 × 8 =
  33. 33.52 × 4 =
  34. 34.12 × 4 =
  35. 35.23 × 4 =
  36. 36.64 × 4 =
  37. 37.13 × 8 =
  38. 38.74 × 4 =
  39. 39.40 × 8 =
  40. 40.39 × 8 =

Answer key

  1. 300
  2. 148
  3. 160
  4. 112
  5. 244
  6. 256
  7. 136
  8. 184
  9. 200
  10. 272
  11. 188
  12. 216
  13. 192
  14. 208
  15. 240
  16. 152
  17. 280
  18. 120
  19. 124
  20. 72
  21. 288
  22. 176
  23. 80
  24. 104
  25. 248
  26. 280
  27. 272
  28. 264
  29. 116
  30. 156
  31. 240
  32. 176
  33. 208
  34. 48
  35. 92
  36. 256
  37. 104
  38. 296
  39. 320
  40. 312

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