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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 525 · 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. 1.11 × 24 =
  2. 2.29 × 18 =
  3. 3.46 × 12 =
  4. 4.20 × 24 =
  5. 5.28 × 15 =
  6. 6.16 × 15 =
  7. 7.12 × 16 =
  8. 8.24 × 24 =
  9. 9.45 × 14 =
  10. 10.28 × 12 =
  11. 11.38 × 12 =
  12. 12.23 × 12 =
  13. 13.34 × 24 =
  14. 14.46 × 16 =
  15. 15.35 × 15 =
  16. 16.33 × 15 =
  17. 17.36 × 24 =
  18. 18.34 × 15 =
  19. 19.31 × 16 =
  20. 20.47 × 18 =
  21. 21.13 × 16 =
  22. 22.13 × 18 =
  23. 23.13 × 15 =
  24. 24.39 × 18 =
  25. 25.25 × 12 =
  26. 26.29 × 12 =
  27. 27.26 × 16 =
  28. 28.23 × 24 =
  29. 29.29 × 14 =
  30. 30.13 × 12 =
  31. 31.34 × 12 =
  32. 32.37 × 12 =
  33. 33.48 × 18 =
  34. 34.21 × 15 =
  35. 35.26 × 12 =
  36. 36.21 × 12 =
  37. 37.30 × 18 =
  38. 38.45 × 18 =
  39. 39.16 × 18 =
  40. 40.20 × 12 =

Answer key

  1. 264
  2. 522
  3. 552
  4. 480
  5. 420
  6. 240
  7. 192
  8. 576
  9. 630
  10. 336
  11. 456
  12. 276
  13. 816
  14. 736
  15. 525
  16. 495
  17. 864
  18. 510
  19. 496
  20. 846
  21. 208
  22. 234
  23. 195
  24. 702
  25. 300
  26. 348
  27. 416
  28. 552
  29. 406
  30. 156
  31. 408
  32. 444
  33. 864
  34. 315
  35. 312
  36. 252
  37. 540
  38. 810
  39. 288
  40. 240

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