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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 552 · 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. 1.41 × 12 =
  2. 2.46 × 24 =
  3. 3.14 × 15 =
  4. 4.16 × 18 =
  5. 5.43 × 24 =
  6. 6.24 × 14 =
  7. 7.41 × 14 =
  8. 8.24 × 16 =
  9. 9.49 × 14 =
  10. 10.21 × 12 =
  11. 11.35 × 15 =
  12. 12.15 × 18 =
  13. 13.18 × 24 =
  14. 14.39 × 14 =
  15. 15.26 × 12 =
  16. 16.16 × 12 =
  17. 17.36 × 14 =
  18. 18.19 × 12 =
  19. 19.35 × 16 =
  20. 20.26 × 24 =
  21. 21.21 × 14 =
  22. 22.19 × 24 =
  23. 23.42 × 12 =
  24. 24.40 × 12 =
  25. 25.38 × 12 =
  26. 26.42 × 14 =
  27. 27.47 × 15 =
  28. 28.30 × 14 =
  29. 29.29 × 18 =
  30. 30.22 × 15 =
  31. 31.20 × 16 =
  32. 32.42 × 16 =
  33. 33.16 × 16 =
  34. 34.44 × 16 =
  35. 35.29 × 24 =
  36. 36.40 × 16 =
  37. 37.41 × 24 =
  38. 38.27 × 15 =
  39. 39.28 × 12 =
  40. 40.19 × 18 =

Answer key

  1. 492
  2. 1104
  3. 210
  4. 288
  5. 1032
  6. 336
  7. 574
  8. 384
  9. 686
  10. 252
  11. 525
  12. 270
  13. 432
  14. 546
  15. 312
  16. 192
  17. 504
  18. 228
  19. 560
  20. 624
  21. 294
  22. 456
  23. 504
  24. 480
  25. 456
  26. 588
  27. 705
  28. 420
  29. 522
  30. 330
  31. 320
  32. 672
  33. 256
  34. 704
  35. 696
  36. 640
  37. 984
  38. 405
  39. 336
  40. 342

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