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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 789 · 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. 1.30 × 8 =
  2. 2.37 × 4 =
  3. 3.40 × 8 =
  4. 4.49 × 4 =
  5. 5.16 × 8 =
  6. 6.25 × 4 =
  7. 7.45 × 4 =
  8. 8.62 × 4 =
  9. 9.28 × 4 =
  10. 10.46 × 4 =
  11. 11.38 × 8 =
  12. 12.29 × 8 =
  13. 13.25 × 8 =
  14. 14.65 × 4 =
  15. 15.39 × 8 =
  16. 16.14 × 4 =
  17. 17.20 × 4 =
  18. 18.39 × 4 =
  19. 19.61 × 4 =
  20. 20.19 × 8 =
  21. 21.12 × 4 =
  22. 22.27 × 8 =
  23. 23.34 × 8 =
  24. 24.15 × 4 =
  25. 25.22 × 4 =
  26. 26.33 × 8 =
  27. 27.60 × 4 =
  28. 28.67 × 4 =
  29. 29.20 × 8 =
  30. 30.32 × 8 =
  31. 31.18 × 8 =
  32. 32.40 × 4 =
  33. 33.24 × 4 =
  34. 34.23 × 8 =
  35. 35.52 × 4 =
  36. 36.54 × 4 =
  37. 37.15 × 8 =
  38. 38.73 × 4 =
  39. 39.13 × 4 =
  40. 40.51 × 4 =

Answer key

  1. 240
  2. 148
  3. 320
  4. 196
  5. 128
  6. 100
  7. 180
  8. 248
  9. 112
  10. 184
  11. 304
  12. 232
  13. 200
  14. 260
  15. 312
  16. 56
  17. 80
  18. 156
  19. 244
  20. 152
  21. 48
  22. 216
  23. 272
  24. 60
  25. 88
  26. 264
  27. 240
  28. 268
  29. 160
  30. 256
  31. 144
  32. 160
  33. 96
  34. 184
  35. 208
  36. 216
  37. 120
  38. 292
  39. 52
  40. 204

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