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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 517 · 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. 1.42 × 12 =
  2. 2.34 × 14 =
  3. 3.23 × 16 =
  4. 4.27 × 18 =
  5. 5.33 × 15 =
  6. 6.40 × 18 =
  7. 7.39 × 16 =
  8. 8.23 × 14 =
  9. 9.39 × 18 =
  10. 10.32 × 24 =
  11. 11.27 × 24 =
  12. 12.23 × 12 =
  13. 13.11 × 12 =
  14. 14.12 × 15 =
  15. 15.20 × 12 =
  16. 16.18 × 15 =
  17. 17.42 × 15 =
  18. 18.34 × 24 =
  19. 19.21 × 15 =
  20. 20.40 × 16 =
  21. 21.35 × 15 =
  22. 22.41 × 15 =
  23. 23.46 × 14 =
  24. 24.21 × 24 =
  25. 25.15 × 18 =
  26. 26.35 × 14 =
  27. 27.29 × 14 =
  28. 28.29 × 16 =
  29. 29.28 × 14 =
  30. 30.44 × 12 =
  31. 31.22 × 18 =
  32. 32.13 × 24 =
  33. 33.49 × 14 =
  34. 34.11 × 24 =
  35. 35.12 × 12 =
  36. 36.44 × 15 =
  37. 37.44 × 14 =
  38. 38.11 × 15 =
  39. 39.33 × 12 =
  40. 40.41 × 18 =

Answer key

  1. 504
  2. 476
  3. 368
  4. 486
  5. 495
  6. 720
  7. 624
  8. 322
  9. 702
  10. 768
  11. 648
  12. 276
  13. 132
  14. 180
  15. 240
  16. 270
  17. 630
  18. 816
  19. 315
  20. 640
  21. 525
  22. 615
  23. 644
  24. 504
  25. 270
  26. 490
  27. 406
  28. 464
  29. 392
  30. 528
  31. 396
  32. 312
  33. 686
  34. 264
  35. 144
  36. 660
  37. 616
  38. 165
  39. 396
  40. 738

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