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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 620 · 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. 1.16 × 8 =
  2. 2.23 × 8 =
  3. 3.35 × 8 =
  4. 4.20 × 8 =
  5. 5.22 × 4 =
  6. 6.24 × 4 =
  7. 7.26 × 4 =
  8. 8.13 × 8 =
  9. 9.34 × 4 =
  10. 10.36 × 4 =
  11. 11.43 × 4 =
  12. 12.36 × 8 =
  13. 13.21 × 8 =
  14. 14.66 × 4 =
  15. 15.59 × 4 =
  16. 16.58 × 4 =
  17. 17.17 × 8 =
  18. 18.34 × 8 =
  19. 19.39 × 8 =
  20. 20.32 × 8 =
  21. 21.27 × 8 =
  22. 22.40 × 8 =
  23. 23.33 × 8 =
  24. 24.18 × 8 =
  25. 25.18 × 4 =
  26. 26.13 × 4 =
  27. 27.12 × 8 =
  28. 28.17 × 4 =
  29. 29.26 × 8 =
  30. 30.15 × 8 =
  31. 31.24 × 8 =
  32. 32.31 × 4 =
  33. 33.73 × 4 =
  34. 34.50 × 4 =
  35. 35.69 × 4 =
  36. 36.25 × 8 =
  37. 37.29 × 4 =
  38. 38.14 × 8 =
  39. 39.41 × 4 =
  40. 40.37 × 8 =

Answer key

  1. 128
  2. 184
  3. 280
  4. 160
  5. 88
  6. 96
  7. 104
  8. 104
  9. 136
  10. 144
  11. 172
  12. 288
  13. 168
  14. 264
  15. 236
  16. 232
  17. 136
  18. 272
  19. 312
  20. 256
  21. 216
  22. 320
  23. 264
  24. 144
  25. 72
  26. 52
  27. 96
  28. 68
  29. 208
  30. 120
  31. 192
  32. 124
  33. 292
  34. 200
  35. 276
  36. 200
  37. 116
  38. 112
  39. 164
  40. 296

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