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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 212 · 40 questions
TalentJR

The trick (Chain the factors): Split the multiplier into two small factors: 12 = 3 × 4, 14 = 2 × 7, 15 = 3 × 5, 16 = 4 × 4, 18 = 2 × 9, 24 = 4 × 6. Multiply by the first factor. Multiply that answer by the second factor (× 4 is double, double).

NameDateTime takenScore ___ / 40
  1. 1.15 × 12 =
  2. 2.31 × 18 =
  3. 3.24 × 18 =
  4. 4.18 × 24 =
  5. 5.20 × 24 =
  6. 6.33 × 18 =
  7. 7.44 × 14 =
  8. 8.17 × 12 =
  9. 9.11 × 24 =
  10. 10.12 × 18 =
  11. 11.41 × 16 =
  12. 12.11 × 14 =
  13. 13.13 × 14 =
  14. 14.15 × 18 =
  15. 15.11 × 12 =
  16. 16.17 × 14 =
  17. 17.36 × 12 =
  18. 18.39 × 12 =
  19. 19.41 × 15 =
  20. 20.29 × 14 =
  21. 21.30 × 24 =
  22. 22.26 × 12 =
  23. 23.47 × 16 =
  24. 24.21 × 24 =
  25. 25.30 × 16 =
  26. 26.24 × 14 =
  27. 27.43 × 12 =
  28. 28.16 × 18 =
  29. 29.36 × 18 =
  30. 30.38 × 24 =
  31. 31.15 × 24 =
  32. 32.22 × 16 =
  33. 33.19 × 18 =
  34. 34.19 × 15 =
  35. 35.25 × 18 =
  36. 36.27 × 24 =
  37. 37.13 × 24 =
  38. 38.25 × 24 =
  39. 39.47 × 18 =
  40. 40.30 × 12 =

Answer key

  1. 180
  2. 558
  3. 432
  4. 432
  5. 480
  6. 594
  7. 616
  8. 204
  9. 264
  10. 216
  11. 656
  12. 154
  13. 182
  14. 270
  15. 132
  16. 238
  17. 432
  18. 468
  19. 615
  20. 406
  21. 720
  22. 312
  23. 752
  24. 504
  25. 480
  26. 336
  27. 516
  28. 288
  29. 648
  30. 912
  31. 360
  32. 352
  33. 342
  34. 285
  35. 450
  36. 648
  37. 312
  38. 600
  39. 846
  40. 360

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