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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 119 · 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. 1.35 × 14 =
  2. 2.12 × 18 =
  3. 3.30 × 18 =
  4. 4.21 × 12 =
  5. 5.11 × 12 =
  6. 6.11 × 14 =
  7. 7.21 × 24 =
  8. 8.36 × 12 =
  9. 9.17 × 18 =
  10. 10.30 × 16 =
  11. 11.36 × 18 =
  12. 12.27 × 24 =
  13. 13.26 × 14 =
  14. 14.47 × 18 =
  15. 15.47 × 14 =
  16. 16.24 × 16 =
  17. 17.16 × 14 =
  18. 18.12 × 15 =
  19. 19.18 × 16 =
  20. 20.29 × 16 =
  21. 21.49 × 15 =
  22. 22.29 × 14 =
  23. 23.15 × 24 =
  24. 24.27 × 16 =
  25. 25.24 × 15 =
  26. 26.12 × 12 =
  27. 27.14 × 16 =
  28. 28.37 × 18 =
  29. 29.25 × 18 =
  30. 30.11 × 24 =
  31. 31.37 × 24 =
  32. 32.19 × 16 =
  33. 33.48 × 12 =
  34. 34.43 × 15 =
  35. 35.26 × 16 =
  36. 36.22 × 15 =
  37. 37.48 × 16 =
  38. 38.16 × 12 =
  39. 39.20 × 18 =
  40. 40.28 × 12 =

Answer key

  1. 490
  2. 216
  3. 540
  4. 252
  5. 132
  6. 154
  7. 504
  8. 432
  9. 306
  10. 480
  11. 648
  12. 648
  13. 364
  14. 846
  15. 658
  16. 384
  17. 224
  18. 180
  19. 288
  20. 464
  21. 735
  22. 406
  23. 360
  24. 432
  25. 360
  26. 144
  27. 224
  28. 666
  29. 450
  30. 264
  31. 888
  32. 304
  33. 576
  34. 645
  35. 416
  36. 330
  37. 768
  38. 192
  39. 360
  40. 336

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