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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 839 · 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. 1.72 × 4 =
  2. 2.73 × 4 =
  3. 3.15 × 8 =
  4. 4.42 × 4 =
  5. 5.32 × 8 =
  6. 6.19 × 4 =
  7. 7.19 × 8 =
  8. 8.28 × 8 =
  9. 9.35 × 4 =
  10. 10.14 × 8 =
  11. 11.30 × 4 =
  12. 12.18 × 8 =
  13. 13.35 × 8 =
  14. 14.69 × 4 =
  15. 15.31 × 8 =
  16. 16.54 × 4 =
  17. 17.23 × 8 =
  18. 18.13 × 8 =
  19. 19.43 × 4 =
  20. 20.38 × 8 =
  21. 21.56 × 4 =
  22. 22.27 × 4 =
  23. 23.68 × 4 =
  24. 24.50 × 4 =
  25. 25.75 × 4 =
  26. 26.44 × 4 =
  27. 27.59 × 4 =
  28. 28.20 × 8 =
  29. 29.36 × 4 =
  30. 30.40 × 4 =
  31. 31.15 × 4 =
  32. 32.48 × 4 =
  33. 33.13 × 4 =
  34. 34.47 × 4 =
  35. 35.25 × 8 =
  36. 36.38 × 4 =
  37. 37.51 × 4 =
  38. 38.24 × 8 =
  39. 39.39 × 8 =
  40. 40.41 × 4 =

Answer key

  1. 288
  2. 292
  3. 120
  4. 168
  5. 256
  6. 76
  7. 152
  8. 224
  9. 140
  10. 112
  11. 120
  12. 144
  13. 280
  14. 276
  15. 248
  16. 216
  17. 184
  18. 104
  19. 172
  20. 304
  21. 224
  22. 108
  23. 272
  24. 200
  25. 300
  26. 176
  27. 236
  28. 160
  29. 144
  30. 160
  31. 60
  32. 192
  33. 52
  34. 188
  35. 200
  36. 152
  37. 204
  38. 192
  39. 312
  40. 164

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