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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 486 · 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. 1.20 × 12 =
  2. 2.14 × 14 =
  3. 3.18 × 24 =
  4. 4.23 × 14 =
  5. 5.37 × 18 =
  6. 6.35 × 15 =
  7. 7.12 × 14 =
  8. 8.23 × 15 =
  9. 9.20 × 18 =
  10. 10.43 × 18 =
  11. 11.28 × 14 =
  12. 12.32 × 18 =
  13. 13.19 × 24 =
  14. 14.21 × 16 =
  15. 15.37 × 14 =
  16. 16.37 × 24 =
  17. 17.48 × 16 =
  18. 18.39 × 12 =
  19. 19.20 × 24 =
  20. 20.22 × 24 =
  21. 21.41 × 15 =
  22. 22.15 × 14 =
  23. 23.24 × 12 =
  24. 24.48 × 18 =
  25. 25.13 × 24 =
  26. 26.23 × 18 =
  27. 27.11 × 15 =
  28. 28.24 × 18 =
  29. 29.30 × 16 =
  30. 30.12 × 12 =
  31. 31.33 × 14 =
  32. 32.41 × 18 =
  33. 33.11 × 18 =
  34. 34.40 × 16 =
  35. 35.46 × 14 =
  36. 36.21 × 15 =
  37. 37.43 × 16 =
  38. 38.35 × 18 =
  39. 39.45 × 14 =
  40. 40.49 × 12 =

Answer key

  1. 240
  2. 196
  3. 432
  4. 322
  5. 666
  6. 525
  7. 168
  8. 345
  9. 360
  10. 774
  11. 392
  12. 576
  13. 456
  14. 336
  15. 518
  16. 888
  17. 768
  18. 468
  19. 480
  20. 528
  21. 615
  22. 210
  23. 288
  24. 864
  25. 312
  26. 414
  27. 165
  28. 432
  29. 480
  30. 144
  31. 462
  32. 738
  33. 198
  34. 640
  35. 644
  36. 315
  37. 688
  38. 630
  39. 630
  40. 588

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