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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 604 · 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. 1.55 × 4 =
  2. 2.61 × 4 =
  3. 3.39 × 4 =
  4. 4.25 × 8 =
  5. 5.15 × 8 =
  6. 6.36 × 4 =
  7. 7.38 × 8 =
  8. 8.65 × 4 =
  9. 9.26 × 4 =
  10. 10.33 × 8 =
  11. 11.28 × 8 =
  12. 12.75 × 4 =
  13. 13.70 × 4 =
  14. 14.34 × 4 =
  15. 15.22 × 8 =
  16. 16.46 × 4 =
  17. 17.18 × 8 =
  18. 18.16 × 8 =
  19. 19.32 × 4 =
  20. 20.28 × 4 =
  21. 21.14 × 4 =
  22. 22.71 × 4 =
  23. 23.31 × 4 =
  24. 24.39 × 8 =
  25. 25.72 × 4 =
  26. 26.21 × 4 =
  27. 27.54 × 4 =
  28. 28.22 × 4 =
  29. 29.30 × 4 =
  30. 30.13 × 8 =
  31. 31.16 × 4 =
  32. 32.13 × 4 =
  33. 33.40 × 4 =
  34. 34.74 × 4 =
  35. 35.43 × 4 =
  36. 36.17 × 8 =
  37. 37.32 × 8 =
  38. 38.12 × 8 =
  39. 39.40 × 8 =
  40. 40.14 × 8 =

Answer key

  1. 220
  2. 244
  3. 156
  4. 200
  5. 120
  6. 144
  7. 304
  8. 260
  9. 104
  10. 264
  11. 224
  12. 300
  13. 280
  14. 136
  15. 176
  16. 184
  17. 144
  18. 128
  19. 128
  20. 112
  21. 56
  22. 284
  23. 124
  24. 312
  25. 288
  26. 84
  27. 216
  28. 88
  29. 120
  30. 104
  31. 64
  32. 52
  33. 160
  34. 296
  35. 172
  36. 136
  37. 256
  38. 96
  39. 320
  40. 112

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