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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 421 · 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. 1.16 × 8 =
  2. 2.70 × 4 =
  3. 3.19 × 8 =
  4. 4.72 × 4 =
  5. 5.18 × 4 =
  6. 6.65 × 4 =
  7. 7.31 × 8 =
  8. 8.26 × 4 =
  9. 9.16 × 4 =
  10. 10.35 × 4 =
  11. 11.20 × 4 =
  12. 12.20 × 8 =
  13. 13.75 × 4 =
  14. 14.68 × 4 =
  15. 15.29 × 4 =
  16. 16.37 × 8 =
  17. 17.28 × 8 =
  18. 18.60 × 4 =
  19. 19.53 × 4 =
  20. 20.32 × 8 =
  21. 21.59 × 4 =
  22. 22.29 × 8 =
  23. 23.15 × 4 =
  24. 24.27 × 4 =
  25. 25.12 × 8 =
  26. 26.69 × 4 =
  27. 27.32 × 4 =
  28. 28.39 × 8 =
  29. 29.40 × 8 =
  30. 30.14 × 8 =
  31. 31.21 × 4 =
  32. 32.13 × 4 =
  33. 33.56 × 4 =
  34. 34.25 × 4 =
  35. 35.62 × 4 =
  36. 36.23 × 8 =
  37. 37.27 × 8 =
  38. 38.41 × 4 =
  39. 39.21 × 8 =
  40. 40.49 × 4 =

Answer key

  1. 128
  2. 280
  3. 152
  4. 288
  5. 72
  6. 260
  7. 248
  8. 104
  9. 64
  10. 140
  11. 80
  12. 160
  13. 300
  14. 272
  15. 116
  16. 296
  17. 224
  18. 240
  19. 212
  20. 256
  21. 236
  22. 232
  23. 60
  24. 108
  25. 96
  26. 276
  27. 128
  28. 312
  29. 320
  30. 112
  31. 84
  32. 52
  33. 224
  34. 100
  35. 248
  36. 184
  37. 216
  38. 164
  39. 168
  40. 196

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