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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 37 · 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. 1.26 × 24 =
  2. 2.18 × 16 =
  3. 3.26 × 12 =
  4. 4.41 × 18 =
  5. 5.31 × 18 =
  6. 6.17 × 12 =
  7. 7.49 × 16 =
  8. 8.27 × 15 =
  9. 9.43 × 14 =
  10. 10.37 × 24 =
  11. 11.48 × 14 =
  12. 12.20 × 24 =
  13. 13.19 × 16 =
  14. 14.40 × 16 =
  15. 15.39 × 12 =
  16. 16.17 × 18 =
  17. 17.12 × 24 =
  18. 18.48 × 15 =
  19. 19.16 × 12 =
  20. 20.11 × 12 =
  21. 21.28 × 12 =
  22. 22.25 × 14 =
  23. 23.26 × 18 =
  24. 24.45 × 18 =
  25. 25.41 × 16 =
  26. 26.33 × 18 =
  27. 27.44 × 12 =
  28. 28.24 × 12 =
  29. 29.15 × 18 =
  30. 30.45 × 12 =
  31. 31.17 × 15 =
  32. 32.42 × 12 =
  33. 33.19 × 24 =
  34. 34.12 × 15 =
  35. 35.43 × 15 =
  36. 36.14 × 12 =
  37. 37.20 × 18 =
  38. 38.30 × 24 =
  39. 39.22 × 18 =
  40. 40.43 × 18 =

Answer key

  1. 624
  2. 288
  3. 312
  4. 738
  5. 558
  6. 204
  7. 784
  8. 405
  9. 602
  10. 888
  11. 672
  12. 480
  13. 304
  14. 640
  15. 468
  16. 306
  17. 288
  18. 720
  19. 192
  20. 132
  21. 336
  22. 350
  23. 468
  24. 810
  25. 656
  26. 594
  27. 528
  28. 288
  29. 270
  30. 540
  31. 255
  32. 504
  33. 456
  34. 180
  35. 645
  36. 168
  37. 360
  38. 720
  39. 396
  40. 774

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