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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 262 · 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. 1.33 × 15 =
  2. 2.37 × 14 =
  3. 3.16 × 24 =
  4. 4.15 × 18 =
  5. 5.26 × 12 =
  6. 6.11 × 12 =
  7. 7.47 × 12 =
  8. 8.30 × 24 =
  9. 9.26 × 16 =
  10. 10.39 × 24 =
  11. 11.30 × 12 =
  12. 12.15 × 12 =
  13. 13.24 × 24 =
  14. 14.46 × 12 =
  15. 15.39 × 16 =
  16. 16.13 × 18 =
  17. 17.27 × 12 =
  18. 18.40 × 15 =
  19. 19.28 × 12 =
  20. 20.42 × 14 =
  21. 21.42 × 16 =
  22. 22.39 × 15 =
  23. 23.28 × 24 =
  24. 24.18 × 14 =
  25. 25.29 × 16 =
  26. 26.21 × 24 =
  27. 27.12 × 14 =
  28. 28.20 × 12 =
  29. 29.48 × 12 =
  30. 30.46 × 16 =
  31. 31.37 × 18 =
  32. 32.46 × 14 =
  33. 33.19 × 24 =
  34. 34.14 × 24 =
  35. 35.20 × 15 =
  36. 36.22 × 18 =
  37. 37.41 × 14 =
  38. 38.35 × 15 =
  39. 39.49 × 12 =
  40. 40.26 × 15 =

Answer key

  1. 495
  2. 518
  3. 384
  4. 270
  5. 312
  6. 132
  7. 564
  8. 720
  9. 416
  10. 936
  11. 360
  12. 180
  13. 576
  14. 552
  15. 624
  16. 234
  17. 324
  18. 600
  19. 336
  20. 588
  21. 672
  22. 585
  23. 672
  24. 252
  25. 464
  26. 504
  27. 168
  28. 240
  29. 576
  30. 736
  31. 666
  32. 644
  33. 456
  34. 336
  35. 300
  36. 396
  37. 574
  38. 525
  39. 588
  40. 390

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