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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 421 · 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. 1.34 × 24 =
  2. 2.43 × 14 =
  3. 3.35 × 14 =
  4. 4.20 × 24 =
  5. 5.12 × 16 =
  6. 6.24 × 15 =
  7. 7.11 × 15 =
  8. 8.34 × 18 =
  9. 9.45 × 12 =
  10. 10.24 × 12 =
  11. 11.22 × 14 =
  12. 12.38 × 14 =
  13. 13.19 × 15 =
  14. 14.14 × 16 =
  15. 15.45 × 18 =
  16. 16.18 × 12 =
  17. 17.27 × 12 =
  18. 18.21 × 18 =
  19. 19.23 × 12 =
  20. 20.48 × 15 =
  21. 21.21 × 12 =
  22. 22.39 × 16 =
  23. 23.28 × 16 =
  24. 24.27 × 15 =
  25. 25.40 × 15 =
  26. 26.19 × 14 =
  27. 27.41 × 24 =
  28. 28.37 × 14 =
  29. 29.26 × 12 =
  30. 30.36 × 15 =
  31. 31.26 × 16 =
  32. 32.11 × 14 =
  33. 33.28 × 18 =
  34. 34.14 × 24 =
  35. 35.18 × 18 =
  36. 36.32 × 12 =
  37. 37.26 × 24 =
  38. 38.16 × 14 =
  39. 39.34 × 15 =
  40. 40.48 × 18 =

Answer key

  1. 816
  2. 602
  3. 490
  4. 480
  5. 192
  6. 360
  7. 165
  8. 612
  9. 540
  10. 288
  11. 308
  12. 532
  13. 285
  14. 224
  15. 810
  16. 216
  17. 324
  18. 378
  19. 276
  20. 720
  21. 252
  22. 624
  23. 448
  24. 405
  25. 600
  26. 266
  27. 984
  28. 518
  29. 312
  30. 540
  31. 416
  32. 154
  33. 504
  34. 336
  35. 324
  36. 384
  37. 624
  38. 224
  39. 510
  40. 864

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