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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 536 · 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. 1.21 × 8 =
  2. 2.14 × 8 =
  3. 3.24 × 8 =
  4. 4.25 × 8 =
  5. 5.15 × 4 =
  6. 6.35 × 4 =
  7. 7.26 × 4 =
  8. 8.69 × 4 =
  9. 9.53 × 4 =
  10. 10.23 × 8 =
  11. 11.15 × 8 =
  12. 12.49 × 4 =
  13. 13.12 × 4 =
  14. 14.18 × 4 =
  15. 15.12 × 8 =
  16. 16.54 × 4 =
  17. 17.70 × 4 =
  18. 18.19 × 8 =
  19. 19.13 × 8 =
  20. 20.44 × 4 =
  21. 21.29 × 8 =
  22. 22.20 × 4 =
  23. 23.18 × 8 =
  24. 24.36 × 8 =
  25. 25.51 × 4 =
  26. 26.16 × 4 =
  27. 27.38 × 8 =
  28. 28.56 × 4 =
  29. 29.34 × 8 =
  30. 30.61 × 4 =
  31. 31.40 × 8 =
  32. 32.71 × 4 =
  33. 33.37 × 8 =
  34. 34.50 × 4 =
  35. 35.25 × 4 =
  36. 36.72 × 4 =
  37. 37.21 × 4 =
  38. 38.42 × 4 =
  39. 39.63 × 4 =
  40. 40.34 × 4 =

Answer key

  1. 168
  2. 112
  3. 192
  4. 200
  5. 60
  6. 140
  7. 104
  8. 276
  9. 212
  10. 184
  11. 120
  12. 196
  13. 48
  14. 72
  15. 96
  16. 216
  17. 280
  18. 152
  19. 104
  20. 176
  21. 232
  22. 80
  23. 144
  24. 288
  25. 204
  26. 64
  27. 304
  28. 224
  29. 272
  30. 244
  31. 320
  32. 284
  33. 296
  34. 200
  35. 100
  36. 288
  37. 84
  38. 168
  39. 252
  40. 136

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