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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 370 · 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. 1.20 × 8 =
  2. 2.46 × 4 =
  3. 3.45 × 4 =
  4. 4.21 × 4 =
  5. 5.60 × 4 =
  6. 6.49 × 4 =
  7. 7.27 × 4 =
  8. 8.29 × 8 =
  9. 9.41 × 4 =
  10. 10.18 × 4 =
  11. 11.54 × 4 =
  12. 12.35 × 4 =
  13. 13.33 × 8 =
  14. 14.29 × 4 =
  15. 15.12 × 8 =
  16. 16.12 × 4 =
  17. 17.14 × 4 =
  18. 18.13 × 8 =
  19. 19.30 × 8 =
  20. 20.69 × 4 =
  21. 21.61 × 4 =
  22. 22.70 × 4 =
  23. 23.73 × 4 =
  24. 24.74 × 4 =
  25. 25.37 × 8 =
  26. 26.18 × 8 =
  27. 27.72 × 4 =
  28. 28.16 × 8 =
  29. 29.14 × 8 =
  30. 30.28 × 8 =
  31. 31.44 × 4 =
  32. 32.40 × 8 =
  33. 33.24 × 8 =
  34. 34.13 × 4 =
  35. 35.27 × 8 =
  36. 36.38 × 8 =
  37. 37.24 × 4 =
  38. 38.43 × 4 =
  39. 39.17 × 8 =
  40. 40.39 × 4 =

Answer key

  1. 160
  2. 184
  3. 180
  4. 84
  5. 240
  6. 196
  7. 108
  8. 232
  9. 164
  10. 72
  11. 216
  12. 140
  13. 264
  14. 116
  15. 96
  16. 48
  17. 56
  18. 104
  19. 240
  20. 276
  21. 244
  22. 280
  23. 292
  24. 296
  25. 296
  26. 144
  27. 288
  28. 128
  29. 112
  30. 224
  31. 176
  32. 320
  33. 192
  34. 52
  35. 216
  36. 304
  37. 96
  38. 172
  39. 136
  40. 156

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