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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 472 · 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 × 15 =
  2. 2.33 × 18 =
  3. 3.38 × 15 =
  4. 4.22 × 15 =
  5. 5.14 × 12 =
  6. 6.20 × 24 =
  7. 7.36 × 14 =
  8. 8.34 × 12 =
  9. 9.11 × 16 =
  10. 10.14 × 16 =
  11. 11.34 × 16 =
  12. 12.37 × 18 =
  13. 13.31 × 18 =
  14. 14.49 × 14 =
  15. 15.33 × 24 =
  16. 16.26 × 12 =
  17. 17.39 × 12 =
  18. 18.30 × 18 =
  19. 19.49 × 16 =
  20. 20.40 × 12 =
  21. 21.20 × 12 =
  22. 22.12 × 18 =
  23. 23.12 × 15 =
  24. 24.49 × 15 =
  25. 25.42 × 12 =
  26. 26.36 × 16 =
  27. 27.21 × 15 =
  28. 28.32 × 24 =
  29. 29.47 × 14 =
  30. 30.23 × 14 =
  31. 31.27 × 16 =
  32. 32.11 × 14 =
  33. 33.23 × 18 =
  34. 34.41 × 18 =
  35. 35.18 × 12 =
  36. 36.12 × 12 =
  37. 37.32 × 16 =
  38. 38.28 × 14 =
  39. 39.33 × 14 =
  40. 40.19 × 14 =

Answer key

  1. 225
  2. 594
  3. 570
  4. 330
  5. 168
  6. 480
  7. 504
  8. 408
  9. 176
  10. 224
  11. 544
  12. 666
  13. 558
  14. 686
  15. 792
  16. 312
  17. 468
  18. 540
  19. 784
  20. 480
  21. 240
  22. 216
  23. 180
  24. 735
  25. 504
  26. 576
  27. 315
  28. 768
  29. 658
  30. 322
  31. 432
  32. 154
  33. 414
  34. 738
  35. 216
  36. 144
  37. 512
  38. 392
  39. 462
  40. 266

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