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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 45 · 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. 1.57 × 4 =
  2. 2.12 × 4 =
  3. 3.18 × 8 =
  4. 4.18 × 4 =
  5. 5.27 × 4 =
  6. 6.35 × 8 =
  7. 7.29 × 8 =
  8. 8.67 × 4 =
  9. 9.71 × 4 =
  10. 10.27 × 8 =
  11. 11.39 × 8 =
  12. 12.32 × 4 =
  13. 13.34 × 8 =
  14. 14.28 × 8 =
  15. 15.42 × 4 =
  16. 16.16 × 8 =
  17. 17.19 × 8 =
  18. 18.56 × 4 =
  19. 19.36 × 8 =
  20. 20.37 × 8 =
  21. 21.38 × 8 =
  22. 22.15 × 4 =
  23. 23.25 × 8 =
  24. 24.12 × 8 =
  25. 25.21 × 4 =
  26. 26.20 × 4 =
  27. 27.40 × 4 =
  28. 28.15 × 8 =
  29. 29.33 × 8 =
  30. 30.22 × 8 =
  31. 31.14 × 8 =
  32. 32.17 × 8 =
  33. 33.37 × 4 =
  34. 34.48 × 4 =
  35. 35.75 × 4 =
  36. 36.14 × 4 =
  37. 37.55 × 4 =
  38. 38.32 × 8 =
  39. 39.26 × 8 =
  40. 40.28 × 4 =

Answer key

  1. 228
  2. 48
  3. 144
  4. 72
  5. 108
  6. 280
  7. 232
  8. 268
  9. 284
  10. 216
  11. 312
  12. 128
  13. 272
  14. 224
  15. 168
  16. 128
  17. 152
  18. 224
  19. 288
  20. 296
  21. 304
  22. 60
  23. 200
  24. 96
  25. 84
  26. 80
  27. 160
  28. 120
  29. 264
  30. 176
  31. 112
  32. 136
  33. 148
  34. 192
  35. 300
  36. 56
  37. 220
  38. 256
  39. 208
  40. 112

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