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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 869 · 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. 1.18 × 14 =
  2. 2.39 × 15 =
  3. 3.37 × 18 =
  4. 4.15 × 18 =
  5. 5.20 × 16 =
  6. 6.21 × 24 =
  7. 7.11 × 18 =
  8. 8.29 × 14 =
  9. 9.13 × 15 =
  10. 10.34 × 14 =
  11. 11.12 × 24 =
  12. 12.13 × 12 =
  13. 13.33 × 24 =
  14. 14.41 × 16 =
  15. 15.19 × 18 =
  16. 16.44 × 18 =
  17. 17.16 × 15 =
  18. 18.26 × 24 =
  19. 19.26 × 12 =
  20. 20.46 × 12 =
  21. 21.47 × 15 =
  22. 22.18 × 24 =
  23. 23.35 × 15 =
  24. 24.29 × 24 =
  25. 25.40 × 15 =
  26. 26.38 × 12 =
  27. 27.44 × 16 =
  28. 28.28 × 18 =
  29. 29.11 × 12 =
  30. 30.43 × 24 =
  31. 31.42 × 24 =
  32. 32.36 × 14 =
  33. 33.41 × 24 =
  34. 34.47 × 24 =
  35. 35.12 × 15 =
  36. 36.16 × 12 =
  37. 37.35 × 12 =
  38. 38.33 × 15 =
  39. 39.43 × 12 =
  40. 40.38 × 24 =

Answer key

  1. 252
  2. 585
  3. 666
  4. 270
  5. 320
  6. 504
  7. 198
  8. 406
  9. 195
  10. 476
  11. 288
  12. 156
  13. 792
  14. 656
  15. 342
  16. 792
  17. 240
  18. 624
  19. 312
  20. 552
  21. 705
  22. 432
  23. 525
  24. 696
  25. 600
  26. 456
  27. 704
  28. 504
  29. 132
  30. 1032
  31. 1008
  32. 504
  33. 984
  34. 1128
  35. 180
  36. 192
  37. 420
  38. 495
  39. 516
  40. 912

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