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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 3 · 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. 1.69 × 4 =
  2. 2.18 × 8 =
  3. 3.44 × 4 =
  4. 4.14 × 4 =
  5. 5.20 × 8 =
  6. 6.21 × 8 =
  7. 7.22 × 8 =
  8. 8.31 × 8 =
  9. 9.37 × 8 =
  10. 10.16 × 4 =
  11. 11.45 × 4 =
  12. 12.70 × 4 =
  13. 13.51 × 4 =
  14. 14.33 × 8 =
  15. 15.13 × 4 =
  16. 16.47 × 4 =
  17. 17.66 × 4 =
  18. 18.19 × 8 =
  19. 19.39 × 4 =
  20. 20.73 × 4 =
  21. 21.32 × 8 =
  22. 22.39 × 8 =
  23. 23.29 × 8 =
  24. 24.68 × 4 =
  25. 25.30 × 4 =
  26. 26.65 × 4 =
  27. 27.60 × 4 =
  28. 28.27 × 4 =
  29. 29.55 × 4 =
  30. 30.36 × 8 =
  31. 31.40 × 4 =
  32. 32.71 × 4 =
  33. 33.15 × 8 =
  34. 34.35 × 4 =
  35. 35.16 × 8 =
  36. 36.26 × 4 =
  37. 37.31 × 4 =
  38. 38.32 × 4 =
  39. 39.37 × 4 =
  40. 40.58 × 4 =

Answer key

  1. 276
  2. 144
  3. 176
  4. 56
  5. 160
  6. 168
  7. 176
  8. 248
  9. 296
  10. 64
  11. 180
  12. 280
  13. 204
  14. 264
  15. 52
  16. 188
  17. 264
  18. 152
  19. 156
  20. 292
  21. 256
  22. 312
  23. 232
  24. 272
  25. 120
  26. 260
  27. 240
  28. 108
  29. 220
  30. 288
  31. 160
  32. 284
  33. 120
  34. 140
  35. 128
  36. 104
  37. 124
  38. 128
  39. 148
  40. 232

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