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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 560 · 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. 1.39 × 15 =
  2. 2.19 × 24 =
  3. 3.29 × 16 =
  4. 4.11 × 24 =
  5. 5.35 × 14 =
  6. 6.14 × 24 =
  7. 7.21 × 24 =
  8. 8.14 × 14 =
  9. 9.29 × 12 =
  10. 10.37 × 15 =
  11. 11.21 × 12 =
  12. 12.11 × 14 =
  13. 13.12 × 18 =
  14. 14.45 × 14 =
  15. 15.14 × 18 =
  16. 16.41 × 14 =
  17. 17.14 × 16 =
  18. 18.31 × 12 =
  19. 19.30 × 24 =
  20. 20.17 × 14 =
  21. 21.34 × 24 =
  22. 22.27 × 12 =
  23. 23.30 × 14 =
  24. 24.46 × 16 =
  25. 25.14 × 12 =
  26. 26.31 × 24 =
  27. 27.43 × 12 =
  28. 28.24 × 16 =
  29. 29.46 × 14 =
  30. 30.31 × 14 =
  31. 31.20 × 18 =
  32. 32.19 × 12 =
  33. 33.29 × 24 =
  34. 34.26 × 16 =
  35. 35.20 × 15 =
  36. 36.23 × 15 =
  37. 37.13 × 16 =
  38. 38.17 × 15 =
  39. 39.28 × 14 =
  40. 40.21 × 18 =

Answer key

  1. 585
  2. 456
  3. 464
  4. 264
  5. 490
  6. 336
  7. 504
  8. 196
  9. 348
  10. 555
  11. 252
  12. 154
  13. 216
  14. 630
  15. 252
  16. 574
  17. 224
  18. 372
  19. 720
  20. 238
  21. 816
  22. 324
  23. 420
  24. 736
  25. 168
  26. 744
  27. 516
  28. 384
  29. 644
  30. 434
  31. 360
  32. 228
  33. 696
  34. 416
  35. 300
  36. 345
  37. 208
  38. 255
  39. 392
  40. 378

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