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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 352 · 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. 1.33 × 12 =
  2. 2.45 × 15 =
  3. 3.28 × 12 =
  4. 4.16 × 15 =
  5. 5.22 × 18 =
  6. 6.20 × 12 =
  7. 7.38 × 18 =
  8. 8.11 × 12 =
  9. 9.14 × 12 =
  10. 10.13 × 12 =
  11. 11.11 × 15 =
  12. 12.24 × 18 =
  13. 13.42 × 12 =
  14. 14.20 × 18 =
  15. 15.48 × 16 =
  16. 16.18 × 16 =
  17. 17.12 × 14 =
  18. 18.41 × 18 =
  19. 19.37 × 12 =
  20. 20.19 × 12 =
  21. 21.30 × 16 =
  22. 22.35 × 16 =
  23. 23.35 × 14 =
  24. 24.15 × 15 =
  25. 25.19 × 24 =
  26. 26.41 × 15 =
  27. 27.37 × 15 =
  28. 28.23 × 15 =
  29. 29.48 × 15 =
  30. 30.42 × 18 =
  31. 31.17 × 12 =
  32. 32.41 × 24 =
  33. 33.29 × 16 =
  34. 34.30 × 14 =
  35. 35.20 × 14 =
  36. 36.20 × 24 =
  37. 37.14 × 18 =
  38. 38.16 × 16 =
  39. 39.16 × 14 =
  40. 40.36 × 14 =

Answer key

  1. 396
  2. 675
  3. 336
  4. 240
  5. 396
  6. 240
  7. 684
  8. 132
  9. 168
  10. 156
  11. 165
  12. 432
  13. 504
  14. 360
  15. 768
  16. 288
  17. 168
  18. 738
  19. 444
  20. 228
  21. 480
  22. 560
  23. 490
  24. 225
  25. 456
  26. 615
  27. 555
  28. 345
  29. 720
  30. 756
  31. 204
  32. 984
  33. 464
  34. 420
  35. 280
  36. 480
  37. 252
  38. 256
  39. 224
  40. 504

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