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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 413 · 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. 1.32 × 18 =
  2. 2.12 × 16 =
  3. 3.16 × 12 =
  4. 4.25 × 24 =
  5. 5.42 × 12 =
  6. 6.13 × 12 =
  7. 7.28 × 15 =
  8. 8.28 × 14 =
  9. 9.29 × 16 =
  10. 10.23 × 15 =
  11. 11.47 × 15 =
  12. 12.26 × 18 =
  13. 13.16 × 14 =
  14. 14.23 × 18 =
  15. 15.15 × 15 =
  16. 16.35 × 12 =
  17. 17.25 × 12 =
  18. 18.37 × 18 =
  19. 19.22 × 12 =
  20. 20.34 × 24 =
  21. 21.26 × 15 =
  22. 22.41 × 16 =
  23. 23.34 × 15 =
  24. 24.17 × 18 =
  25. 25.42 × 14 =
  26. 26.24 × 12 =
  27. 27.24 × 15 =
  28. 28.24 × 18 =
  29. 29.44 × 16 =
  30. 30.28 × 12 =
  31. 31.42 × 15 =
  32. 32.46 × 18 =
  33. 33.13 × 18 =
  34. 34.20 × 15 =
  35. 35.38 × 12 =
  36. 36.44 × 12 =
  37. 37.40 × 12 =
  38. 38.14 × 12 =
  39. 39.48 × 15 =
  40. 40.47 × 16 =

Answer key

  1. 576
  2. 192
  3. 192
  4. 600
  5. 504
  6. 156
  7. 420
  8. 392
  9. 464
  10. 345
  11. 705
  12. 468
  13. 224
  14. 414
  15. 225
  16. 420
  17. 300
  18. 666
  19. 264
  20. 816
  21. 390
  22. 656
  23. 510
  24. 306
  25. 588
  26. 288
  27. 360
  28. 432
  29. 704
  30. 336
  31. 630
  32. 828
  33. 234
  34. 300
  35. 456
  36. 528
  37. 480
  38. 168
  39. 720
  40. 752

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