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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 408 · 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. 1.22 × 24 =
  2. 2.23 × 16 =
  3. 3.34 × 14 =
  4. 4.49 × 15 =
  5. 5.48 × 12 =
  6. 6.34 × 18 =
  7. 7.20 × 18 =
  8. 8.45 × 12 =
  9. 9.12 × 15 =
  10. 10.21 × 14 =
  11. 11.17 × 15 =
  12. 12.27 × 15 =
  13. 13.29 × 16 =
  14. 14.31 × 18 =
  15. 15.34 × 24 =
  16. 16.19 × 12 =
  17. 17.49 × 18 =
  18. 18.16 × 14 =
  19. 19.41 × 24 =
  20. 20.17 × 14 =
  21. 21.30 × 24 =
  22. 22.46 × 14 =
  23. 23.48 × 18 =
  24. 24.48 × 15 =
  25. 25.44 × 12 =
  26. 26.45 × 15 =
  27. 27.38 × 12 =
  28. 28.11 × 14 =
  29. 29.22 × 18 =
  30. 30.11 × 15 =
  31. 31.24 × 18 =
  32. 32.23 × 14 =
  33. 33.14 × 16 =
  34. 34.36 × 14 =
  35. 35.17 × 12 =
  36. 36.23 × 15 =
  37. 37.43 × 12 =
  38. 38.40 × 14 =
  39. 39.12 × 18 =
  40. 40.37 × 15 =

Answer key

  1. 528
  2. 368
  3. 476
  4. 735
  5. 576
  6. 612
  7. 360
  8. 540
  9. 180
  10. 294
  11. 255
  12. 405
  13. 464
  14. 558
  15. 816
  16. 228
  17. 882
  18. 224
  19. 984
  20. 238
  21. 720
  22. 644
  23. 864
  24. 720
  25. 528
  26. 675
  27. 456
  28. 154
  29. 396
  30. 165
  31. 432
  32. 322
  33. 224
  34. 504
  35. 204
  36. 345
  37. 516
  38. 560
  39. 216
  40. 555

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