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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 64 · 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. 1.14 × 8 =
  2. 2.36 × 8 =
  3. 3.71 × 4 =
  4. 4.38 × 8 =
  5. 5.37 × 8 =
  6. 6.25 × 8 =
  7. 7.50 × 4 =
  8. 8.21 × 8 =
  9. 9.13 × 8 =
  10. 10.66 × 4 =
  11. 11.40 × 8 =
  12. 12.22 × 8 =
  13. 13.40 × 4 =
  14. 14.31 × 8 =
  15. 15.18 × 8 =
  16. 16.12 × 4 =
  17. 17.15 × 8 =
  18. 18.30 × 4 =
  19. 19.58 × 4 =
  20. 20.34 × 8 =
  21. 21.24 × 4 =
  22. 22.30 × 8 =
  23. 23.62 × 4 =
  24. 24.14 × 4 =
  25. 25.55 × 4 =
  26. 26.35 × 4 =
  27. 27.24 × 8 =
  28. 28.23 × 4 =
  29. 29.19 × 8 =
  30. 30.41 × 4 =
  31. 31.20 × 4 =
  32. 32.23 × 8 =
  33. 33.29 × 8 =
  34. 34.53 × 4 =
  35. 35.37 × 4 =
  36. 36.47 × 4 =
  37. 37.28 × 4 =
  38. 38.16 × 8 =
  39. 39.29 × 4 =
  40. 40.35 × 8 =

Answer key

  1. 112
  2. 288
  3. 284
  4. 304
  5. 296
  6. 200
  7. 200
  8. 168
  9. 104
  10. 264
  11. 320
  12. 176
  13. 160
  14. 248
  15. 144
  16. 48
  17. 120
  18. 120
  19. 232
  20. 272
  21. 96
  22. 240
  23. 248
  24. 56
  25. 220
  26. 140
  27. 192
  28. 92
  29. 152
  30. 164
  31. 80
  32. 184
  33. 232
  34. 212
  35. 148
  36. 188
  37. 112
  38. 128
  39. 116
  40. 280

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