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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 515 · 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. 1.30 × 24 =
  2. 2.47 × 14 =
  3. 3.16 × 15 =
  4. 4.47 × 12 =
  5. 5.49 × 12 =
  6. 6.15 × 14 =
  7. 7.30 × 18 =
  8. 8.47 × 18 =
  9. 9.25 × 18 =
  10. 10.23 × 12 =
  11. 11.27 × 15 =
  12. 12.47 × 15 =
  13. 13.34 × 14 =
  14. 14.31 × 14 =
  15. 15.44 × 14 =
  16. 16.40 × 16 =
  17. 17.42 × 16 =
  18. 18.21 × 12 =
  19. 19.14 × 12 =
  20. 20.19 × 15 =
  21. 21.13 × 18 =
  22. 22.18 × 15 =
  23. 23.45 × 14 =
  24. 24.33 × 18 =
  25. 25.14 × 14 =
  26. 26.28 × 14 =
  27. 27.24 × 16 =
  28. 28.23 × 14 =
  29. 29.22 × 14 =
  30. 30.26 × 18 =
  31. 31.15 × 18 =
  32. 32.23 × 15 =
  33. 33.36 × 14 =
  34. 34.38 × 12 =
  35. 35.45 × 18 =
  36. 36.21 × 16 =
  37. 37.39 × 16 =
  38. 38.18 × 12 =
  39. 39.39 × 18 =
  40. 40.21 × 18 =

Answer key

  1. 720
  2. 658
  3. 240
  4. 564
  5. 588
  6. 210
  7. 540
  8. 846
  9. 450
  10. 276
  11. 405
  12. 705
  13. 476
  14. 434
  15. 616
  16. 640
  17. 672
  18. 252
  19. 168
  20. 285
  21. 234
  22. 270
  23. 630
  24. 594
  25. 196
  26. 392
  27. 384
  28. 322
  29. 308
  30. 468
  31. 270
  32. 345
  33. 504
  34. 456
  35. 810
  36. 336
  37. 624
  38. 216
  39. 702
  40. 378

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