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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 366 · 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 × 24 =
  2. 2.26 × 16 =
  3. 3.25 × 12 =
  4. 4.19 × 16 =
  5. 5.30 × 24 =
  6. 6.45 × 12 =
  7. 7.36 × 14 =
  8. 8.49 × 12 =
  9. 9.37 × 15 =
  10. 10.44 × 16 =
  11. 11.32 × 16 =
  12. 12.35 × 14 =
  13. 13.26 × 18 =
  14. 14.13 × 18 =
  15. 15.22 × 24 =
  16. 16.42 × 18 =
  17. 17.22 × 14 =
  18. 18.33 × 24 =
  19. 19.44 × 18 =
  20. 20.32 × 15 =
  21. 21.18 × 15 =
  22. 22.21 × 12 =
  23. 23.48 × 16 =
  24. 24.14 × 14 =
  25. 25.37 × 14 =
  26. 26.39 × 16 =
  27. 27.48 × 14 =
  28. 28.26 × 24 =
  29. 29.41 × 24 =
  30. 30.17 × 12 =
  31. 31.25 × 18 =
  32. 32.49 × 15 =
  33. 33.26 × 15 =
  34. 34.20 × 18 =
  35. 35.31 × 18 =
  36. 36.24 × 12 =
  37. 37.16 × 18 =
  38. 38.16 × 14 =
  39. 39.35 × 24 =
  40. 40.31 × 16 =

Answer key

  1. 360
  2. 416
  3. 300
  4. 304
  5. 720
  6. 540
  7. 504
  8. 588
  9. 555
  10. 704
  11. 512
  12. 490
  13. 468
  14. 234
  15. 528
  16. 756
  17. 308
  18. 792
  19. 792
  20. 480
  21. 270
  22. 252
  23. 768
  24. 196
  25. 518
  26. 624
  27. 672
  28. 624
  29. 984
  30. 204
  31. 450
  32. 735
  33. 390
  34. 360
  35. 558
  36. 288
  37. 288
  38. 224
  39. 840
  40. 496

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