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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 812 · 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. 1.46 × 12 =
  2. 2.39 × 18 =
  3. 3.19 × 12 =
  4. 4.38 × 14 =
  5. 5.26 × 24 =
  6. 6.22 × 16 =
  7. 7.34 × 24 =
  8. 8.31 × 18 =
  9. 9.24 × 24 =
  10. 10.20 × 15 =
  11. 11.15 × 16 =
  12. 12.18 × 18 =
  13. 13.38 × 24 =
  14. 14.38 × 18 =
  15. 15.25 × 12 =
  16. 16.28 × 15 =
  17. 17.45 × 14 =
  18. 18.37 × 24 =
  19. 19.35 × 18 =
  20. 20.35 × 14 =
  21. 21.25 × 24 =
  22. 22.16 × 16 =
  23. 23.35 × 16 =
  24. 24.41 × 14 =
  25. 25.20 × 12 =
  26. 26.13 × 14 =
  27. 27.44 × 16 =
  28. 28.35 × 12 =
  29. 29.33 × 14 =
  30. 30.14 × 18 =
  31. 31.26 × 18 =
  32. 32.42 × 15 =
  33. 33.11 × 14 =
  34. 34.24 × 12 =
  35. 35.26 × 15 =
  36. 36.36 × 15 =
  37. 37.15 × 14 =
  38. 38.19 × 16 =
  39. 39.29 × 14 =
  40. 40.30 × 18 =

Answer key

  1. 552
  2. 702
  3. 228
  4. 532
  5. 624
  6. 352
  7. 816
  8. 558
  9. 576
  10. 300
  11. 240
  12. 324
  13. 912
  14. 684
  15. 300
  16. 420
  17. 630
  18. 888
  19. 630
  20. 490
  21. 600
  22. 256
  23. 560
  24. 574
  25. 240
  26. 182
  27. 704
  28. 420
  29. 462
  30. 252
  31. 468
  32. 630
  33. 154
  34. 288
  35. 390
  36. 540
  37. 210
  38. 304
  39. 406
  40. 540

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