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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 253 · 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. 2.48 × 15 =
  3. 3.19 × 18 =
  4. 4.30 × 24 =
  5. 5.19 × 16 =
  6. 6.16 × 15 =
  7. 7.24 × 15 =
  8. 8.39 × 14 =
  9. 9.13 × 14 =
  10. 10.29 × 12 =
  11. 11.36 × 14 =
  12. 12.29 × 14 =
  13. 13.28 × 14 =
  14. 14.20 × 12 =
  15. 15.22 × 18 =
  16. 16.16 × 24 =
  17. 17.49 × 14 =
  18. 18.31 × 18 =
  19. 19.41 × 24 =
  20. 20.48 × 12 =
  21. 21.13 × 24 =
  22. 22.39 × 16 =
  23. 23.12 × 24 =
  24. 24.29 × 24 =
  25. 25.46 × 18 =
  26. 26.18 × 12 =
  27. 27.27 × 16 =
  28. 28.13 × 16 =
  29. 29.39 × 12 =
  30. 30.23 × 18 =
  31. 31.21 × 24 =
  32. 32.43 × 16 =
  33. 33.45 × 12 =
  34. 34.36 × 15 =
  35. 35.30 × 14 =
  36. 36.30 × 12 =
  37. 37.32 × 15 =
  38. 38.22 × 14 =
  39. 39.41 × 12 =
  40. 40.40 × 14 =

Answer key

  1. 504
  2. 720
  3. 342
  4. 720
  5. 304
  6. 240
  7. 360
  8. 546
  9. 182
  10. 348
  11. 504
  12. 406
  13. 392
  14. 240
  15. 396
  16. 384
  17. 686
  18. 558
  19. 984
  20. 576
  21. 312
  22. 624
  23. 288
  24. 696
  25. 828
  26. 216
  27. 432
  28. 208
  29. 468
  30. 414
  31. 504
  32. 688
  33. 540
  34. 540
  35. 420
  36. 360
  37. 480
  38. 308
  39. 492
  40. 560

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