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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 85 · 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. 1.11 × 24 =
  2. 2.29 × 12 =
  3. 3.36 × 18 =
  4. 4.40 × 12 =
  5. 5.42 × 18 =
  6. 6.19 × 14 =
  7. 7.18 × 12 =
  8. 8.36 × 12 =
  9. 9.35 × 16 =
  10. 10.43 × 15 =
  11. 11.36 × 16 =
  12. 12.17 × 12 =
  13. 13.37 × 24 =
  14. 14.21 × 12 =
  15. 15.46 × 14 =
  16. 16.35 × 15 =
  17. 17.47 × 18 =
  18. 18.42 × 12 =
  19. 19.25 × 24 =
  20. 20.17 × 15 =
  21. 21.45 × 15 =
  22. 22.14 × 14 =
  23. 23.41 × 15 =
  24. 24.29 × 14 =
  25. 25.41 × 12 =
  26. 26.30 × 24 =
  27. 27.20 × 12 =
  28. 28.21 × 18 =
  29. 29.43 × 12 =
  30. 30.17 × 14 =
  31. 31.20 × 14 =
  32. 32.43 × 14 =
  33. 33.41 × 14 =
  34. 34.13 × 18 =
  35. 35.19 × 16 =
  36. 36.39 × 18 =
  37. 37.15 × 24 =
  38. 38.35 × 12 =
  39. 39.11 × 12 =
  40. 40.20 × 24 =

Answer key

  1. 264
  2. 348
  3. 648
  4. 480
  5. 756
  6. 266
  7. 216
  8. 432
  9. 560
  10. 645
  11. 576
  12. 204
  13. 888
  14. 252
  15. 644
  16. 525
  17. 846
  18. 504
  19. 600
  20. 255
  21. 675
  22. 196
  23. 615
  24. 406
  25. 492
  26. 720
  27. 240
  28. 378
  29. 516
  30. 238
  31. 280
  32. 602
  33. 574
  34. 234
  35. 304
  36. 702
  37. 360
  38. 420
  39. 132
  40. 480

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