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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 755 · 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. 1.23 × 16 =
  2. 2.21 × 16 =
  3. 3.22 × 15 =
  4. 4.33 × 14 =
  5. 5.14 × 16 =
  6. 6.41 × 15 =
  7. 7.19 × 12 =
  8. 8.16 × 24 =
  9. 9.31 × 16 =
  10. 10.13 × 18 =
  11. 11.29 × 15 =
  12. 12.41 × 14 =
  13. 13.14 × 12 =
  14. 14.49 × 15 =
  15. 15.17 × 24 =
  16. 16.46 × 12 =
  17. 17.49 × 14 =
  18. 18.40 × 16 =
  19. 19.27 × 12 =
  20. 20.32 × 15 =
  21. 21.34 × 15 =
  22. 22.46 × 16 =
  23. 23.11 × 12 =
  24. 24.34 × 24 =
  25. 25.15 × 15 =
  26. 26.45 × 14 =
  27. 27.21 × 14 =
  28. 28.19 × 14 =
  29. 29.35 × 15 =
  30. 30.24 × 15 =
  31. 31.16 × 18 =
  32. 32.11 × 14 =
  33. 33.28 × 12 =
  34. 34.18 × 14 =
  35. 35.32 × 16 =
  36. 36.48 × 14 =
  37. 37.29 × 14 =
  38. 38.43 × 18 =
  39. 39.11 × 18 =
  40. 40.38 × 24 =

Answer key

  1. 368
  2. 336
  3. 330
  4. 462
  5. 224
  6. 615
  7. 228
  8. 384
  9. 496
  10. 234
  11. 435
  12. 574
  13. 168
  14. 735
  15. 408
  16. 552
  17. 686
  18. 640
  19. 324
  20. 480
  21. 510
  22. 736
  23. 132
  24. 816
  25. 225
  26. 630
  27. 294
  28. 266
  29. 525
  30. 360
  31. 288
  32. 154
  33. 336
  34. 252
  35. 512
  36. 672
  37. 406
  38. 774
  39. 198
  40. 912

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