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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 447 · 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 × 15 =
  2. 2.30 × 14 =
  3. 3.27 × 24 =
  4. 4.24 × 15 =
  5. 5.13 × 12 =
  6. 6.24 × 14 =
  7. 7.45 × 12 =
  8. 8.31 × 16 =
  9. 9.48 × 12 =
  10. 10.23 × 24 =
  11. 11.17 × 15 =
  12. 12.39 × 14 =
  13. 13.21 × 15 =
  14. 14.19 × 14 =
  15. 15.34 × 14 =
  16. 16.48 × 18 =
  17. 17.38 × 24 =
  18. 18.45 × 16 =
  19. 19.38 × 12 =
  20. 20.14 × 12 =
  21. 21.13 × 15 =
  22. 22.29 × 18 =
  23. 23.20 × 14 =
  24. 24.12 × 18 =
  25. 25.16 × 14 =
  26. 26.29 × 14 =
  27. 27.42 × 12 =
  28. 28.46 × 18 =
  29. 29.37 × 16 =
  30. 30.21 × 24 =
  31. 31.14 × 14 =
  32. 32.35 × 14 =
  33. 33.25 × 24 =
  34. 34.33 × 15 =
  35. 35.17 × 14 =
  36. 36.49 × 12 =
  37. 37.43 × 12 =
  38. 38.15 × 24 =
  39. 39.44 × 16 =
  40. 40.15 × 18 =

Answer key

  1. 300
  2. 420
  3. 648
  4. 360
  5. 156
  6. 336
  7. 540
  8. 496
  9. 576
  10. 552
  11. 255
  12. 546
  13. 315
  14. 266
  15. 476
  16. 864
  17. 912
  18. 720
  19. 456
  20. 168
  21. 195
  22. 522
  23. 280
  24. 216
  25. 224
  26. 406
  27. 504
  28. 828
  29. 592
  30. 504
  31. 196
  32. 490
  33. 600
  34. 495
  35. 238
  36. 588
  37. 516
  38. 360
  39. 704
  40. 270

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