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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 812 · 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. 1.21 × 8 =
  2. 2.36 × 8 =
  3. 3.17 × 8 =
  4. 4.60 × 4 =
  5. 5.12 × 8 =
  6. 6.14 × 8 =
  7. 7.29 × 8 =
  8. 8.39 × 8 =
  9. 9.41 × 4 =
  10. 10.72 × 4 =
  11. 11.22 × 4 =
  12. 12.65 × 4 =
  13. 13.31 × 8 =
  14. 14.70 × 4 =
  15. 15.44 × 4 =
  16. 16.29 × 4 =
  17. 17.54 × 4 =
  18. 18.52 × 4 =
  19. 19.13 × 8 =
  20. 20.30 × 4 =
  21. 21.40 × 8 =
  22. 22.34 × 4 =
  23. 23.49 × 4 =
  24. 24.66 × 4 =
  25. 25.58 × 4 =
  26. 26.62 × 4 =
  27. 27.16 × 4 =
  28. 28.25 × 4 =
  29. 29.26 × 8 =
  30. 30.48 × 4 =
  31. 31.16 × 8 =
  32. 32.33 × 8 =
  33. 33.45 × 4 =
  34. 34.35 × 8 =
  35. 35.50 × 4 =
  36. 36.40 × 4 =
  37. 37.36 × 4 =
  38. 38.75 × 4 =
  39. 39.32 × 4 =
  40. 40.42 × 4 =

Answer key

  1. 168
  2. 288
  3. 136
  4. 240
  5. 96
  6. 112
  7. 232
  8. 312
  9. 164
  10. 288
  11. 88
  12. 260
  13. 248
  14. 280
  15. 176
  16. 116
  17. 216
  18. 208
  19. 104
  20. 120
  21. 320
  22. 136
  23. 196
  24. 264
  25. 232
  26. 248
  27. 64
  28. 100
  29. 208
  30. 192
  31. 128
  32. 264
  33. 180
  34. 280
  35. 200
  36. 160
  37. 144
  38. 300
  39. 128
  40. 168

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