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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 164 · 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. 1.40 × 8 =
  2. 2.15 × 8 =
  3. 3.17 × 8 =
  4. 4.21 × 8 =
  5. 5.28 × 4 =
  6. 6.32 × 8 =
  7. 7.38 × 8 =
  8. 8.13 × 8 =
  9. 9.49 × 4 =
  10. 10.59 × 4 =
  11. 11.42 × 4 =
  12. 12.24 × 8 =
  13. 13.55 × 4 =
  14. 14.34 × 8 =
  15. 15.30 × 8 =
  16. 16.75 × 4 =
  17. 17.27 × 8 =
  18. 18.72 × 4 =
  19. 19.45 × 4 =
  20. 20.62 × 4 =
  21. 21.15 × 4 =
  22. 22.22 × 8 =
  23. 23.37 × 8 =
  24. 24.27 × 4 =
  25. 25.33 × 8 =
  26. 26.13 × 4 =
  27. 27.17 × 4 =
  28. 28.12 × 4 =
  29. 29.35 × 4 =
  30. 30.14 × 4 =
  31. 31.19 × 8 =
  32. 32.23 × 8 =
  33. 33.20 × 4 =
  34. 34.69 × 4 =
  35. 35.54 × 4 =
  36. 36.20 × 8 =
  37. 37.30 × 4 =
  38. 38.37 × 4 =
  39. 39.21 × 4 =
  40. 40.29 × 8 =

Answer key

  1. 320
  2. 120
  3. 136
  4. 168
  5. 112
  6. 256
  7. 304
  8. 104
  9. 196
  10. 236
  11. 168
  12. 192
  13. 220
  14. 272
  15. 240
  16. 300
  17. 216
  18. 288
  19. 180
  20. 248
  21. 60
  22. 176
  23. 296
  24. 108
  25. 264
  26. 52
  27. 68
  28. 48
  29. 140
  30. 56
  31. 152
  32. 184
  33. 80
  34. 276
  35. 216
  36. 160
  37. 120
  38. 148
  39. 84
  40. 232

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