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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 832 · 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. 1.12 × 18 =
  2. 2.18 × 16 =
  3. 3.19 × 18 =
  4. 4.34 × 15 =
  5. 5.28 × 16 =
  6. 6.26 × 24 =
  7. 7.17 × 15 =
  8. 8.12 × 24 =
  9. 9.47 × 16 =
  10. 10.13 × 15 =
  11. 11.13 × 12 =
  12. 12.43 × 15 =
  13. 13.48 × 14 =
  14. 14.35 × 12 =
  15. 15.27 × 16 =
  16. 16.29 × 18 =
  17. 17.21 × 16 =
  18. 18.40 × 14 =
  19. 19.22 × 14 =
  20. 20.31 × 15 =
  21. 21.18 × 12 =
  22. 22.48 × 15 =
  23. 23.42 × 18 =
  24. 24.23 × 16 =
  25. 25.24 × 15 =
  26. 26.29 × 14 =
  27. 27.26 × 14 =
  28. 28.20 × 16 =
  29. 29.41 × 14 =
  30. 30.16 × 24 =
  31. 31.41 × 12 =
  32. 32.17 × 14 =
  33. 33.19 × 24 =
  34. 34.26 × 12 =
  35. 35.23 × 12 =
  36. 36.25 × 12 =
  37. 37.45 × 14 =
  38. 38.25 × 24 =
  39. 39.21 × 24 =
  40. 40.22 × 24 =

Answer key

  1. 216
  2. 288
  3. 342
  4. 510
  5. 448
  6. 624
  7. 255
  8. 288
  9. 752
  10. 195
  11. 156
  12. 645
  13. 672
  14. 420
  15. 432
  16. 522
  17. 336
  18. 560
  19. 308
  20. 465
  21. 216
  22. 720
  23. 756
  24. 368
  25. 360
  26. 406
  27. 364
  28. 320
  29. 574
  30. 384
  31. 492
  32. 238
  33. 456
  34. 312
  35. 276
  36. 300
  37. 630
  38. 600
  39. 504
  40. 528

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