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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 157 · 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. 1.12 × 8 =
  2. 2.70 × 4 =
  3. 3.24 × 4 =
  4. 4.20 × 4 =
  5. 5.19 × 8 =
  6. 6.61 × 4 =
  7. 7.32 × 4 =
  8. 8.18 × 8 =
  9. 9.43 × 4 =
  10. 10.39 × 8 =
  11. 11.45 × 4 =
  12. 12.54 × 4 =
  13. 13.16 × 8 =
  14. 14.30 × 8 =
  15. 15.12 × 4 =
  16. 16.51 × 4 =
  17. 17.19 × 4 =
  18. 18.34 × 8 =
  19. 19.66 × 4 =
  20. 20.14 × 4 =
  21. 21.64 × 4 =
  22. 22.32 × 8 =
  23. 23.37 × 8 =
  24. 24.59 × 4 =
  25. 25.33 × 4 =
  26. 26.23 × 4 =
  27. 27.18 × 4 =
  28. 28.48 × 4 =
  29. 29.42 × 4 =
  30. 30.35 × 8 =
  31. 31.36 × 8 =
  32. 32.15 × 8 =
  33. 33.62 × 4 =
  34. 34.31 × 8 =
  35. 35.38 × 8 =
  36. 36.22 × 8 =
  37. 37.53 × 4 =
  38. 38.29 × 4 =
  39. 39.56 × 4 =
  40. 40.36 × 4 =

Answer key

  1. 96
  2. 280
  3. 96
  4. 80
  5. 152
  6. 244
  7. 128
  8. 144
  9. 172
  10. 312
  11. 180
  12. 216
  13. 128
  14. 240
  15. 48
  16. 204
  17. 76
  18. 272
  19. 264
  20. 56
  21. 256
  22. 256
  23. 296
  24. 236
  25. 132
  26. 92
  27. 72
  28. 192
  29. 168
  30. 280
  31. 288
  32. 120
  33. 248
  34. 248
  35. 304
  36. 176
  37. 212
  38. 116
  39. 224
  40. 144

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