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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 149 · 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. 1.36 × 8 =
  2. 2.17 × 4 =
  3. 3.66 × 4 =
  4. 4.45 × 4 =
  5. 5.20 × 8 =
  6. 6.15 × 4 =
  7. 7.22 × 8 =
  8. 8.19 × 4 =
  9. 9.70 × 4 =
  10. 10.23 × 8 =
  11. 11.15 × 8 =
  12. 12.54 × 4 =
  13. 13.42 × 4 =
  14. 14.35 × 4 =
  15. 15.27 × 8 =
  16. 16.40 × 4 =
  17. 17.16 × 4 =
  18. 18.60 × 4 =
  19. 19.27 × 4 =
  20. 20.71 × 4 =
  21. 21.34 × 8 =
  22. 22.58 × 4 =
  23. 23.30 × 8 =
  24. 24.38 × 8 =
  25. 25.19 × 8 =
  26. 26.26 × 4 =
  27. 27.37 × 4 =
  28. 28.16 × 8 =
  29. 29.17 × 8 =
  30. 30.63 × 4 =
  31. 31.12 × 8 =
  32. 32.31 × 4 =
  33. 33.28 × 8 =
  34. 34.24 × 8 =
  35. 35.65 × 4 =
  36. 36.35 × 8 =
  37. 37.39 × 4 =
  38. 38.38 × 4 =
  39. 39.25 × 8 =
  40. 40.37 × 8 =

Answer key

  1. 288
  2. 68
  3. 264
  4. 180
  5. 160
  6. 60
  7. 176
  8. 76
  9. 280
  10. 184
  11. 120
  12. 216
  13. 168
  14. 140
  15. 216
  16. 160
  17. 64
  18. 240
  19. 108
  20. 284
  21. 272
  22. 232
  23. 240
  24. 304
  25. 152
  26. 104
  27. 148
  28. 128
  29. 136
  30. 252
  31. 96
  32. 124
  33. 224
  34. 192
  35. 260
  36. 280
  37. 156
  38. 152
  39. 200
  40. 296

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