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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 910 · 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. 1.31 × 4 =
  2. 2.28 × 8 =
  3. 3.67 × 4 =
  4. 4.70 × 4 =
  5. 5.15 × 8 =
  6. 6.21 × 8 =
  7. 7.57 × 4 =
  8. 8.60 × 4 =
  9. 9.27 × 4 =
  10. 10.54 × 4 =
  11. 11.50 × 4 =
  12. 12.20 × 4 =
  13. 13.30 × 4 =
  14. 14.31 × 8 =
  15. 15.39 × 8 =
  16. 16.26 × 4 =
  17. 17.15 × 4 =
  18. 18.47 × 4 =
  19. 19.12 × 8 =
  20. 20.55 × 4 =
  21. 21.29 × 8 =
  22. 22.25 × 8 =
  23. 23.13 × 8 =
  24. 24.36 × 8 =
  25. 25.18 × 8 =
  26. 26.71 × 4 =
  27. 27.28 × 4 =
  28. 28.22 × 4 =
  29. 29.22 × 8 =
  30. 30.59 × 4 =
  31. 31.30 × 8 =
  32. 32.33 × 8 =
  33. 33.43 × 4 =
  34. 34.17 × 8 =
  35. 35.38 × 8 =
  36. 36.21 × 4 =
  37. 37.33 × 4 =
  38. 38.37 × 8 =
  39. 39.23 × 4 =
  40. 40.14 × 4 =

Answer key

  1. 124
  2. 224
  3. 268
  4. 280
  5. 120
  6. 168
  7. 228
  8. 240
  9. 108
  10. 216
  11. 200
  12. 80
  13. 120
  14. 248
  15. 312
  16. 104
  17. 60
  18. 188
  19. 96
  20. 220
  21. 232
  22. 200
  23. 104
  24. 288
  25. 144
  26. 284
  27. 112
  28. 88
  29. 176
  30. 236
  31. 240
  32. 264
  33. 172
  34. 136
  35. 304
  36. 84
  37. 132
  38. 296
  39. 92
  40. 56

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