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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 884 · 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 × 12 =
  2. 2.35 × 12 =
  3. 3.31 × 16 =
  4. 4.14 × 16 =
  5. 5.24 × 14 =
  6. 6.11 × 16 =
  7. 7.13 × 24 =
  8. 8.45 × 12 =
  9. 9.36 × 16 =
  10. 10.18 × 18 =
  11. 11.15 × 18 =
  12. 12.25 × 14 =
  13. 13.19 × 14 =
  14. 14.15 × 16 =
  15. 15.35 × 24 =
  16. 16.14 × 24 =
  17. 17.47 × 12 =
  18. 18.26 × 16 =
  19. 19.42 × 16 =
  20. 20.26 × 14 =
  21. 21.20 × 15 =
  22. 22.33 × 14 =
  23. 23.30 × 16 =
  24. 24.23 × 14 =
  25. 25.13 × 15 =
  26. 26.42 × 12 =
  27. 27.48 × 14 =
  28. 28.41 × 14 =
  29. 29.21 × 12 =
  30. 30.12 × 14 =
  31. 31.24 × 12 =
  32. 32.11 × 18 =
  33. 33.25 × 12 =
  34. 34.22 × 12 =
  35. 35.21 × 14 =
  36. 36.34 × 24 =
  37. 37.36 × 18 =
  38. 38.17 × 14 =
  39. 39.21 × 15 =
  40. 40.11 × 14 =

Answer key

  1. 144
  2. 420
  3. 496
  4. 224
  5. 336
  6. 176
  7. 312
  8. 540
  9. 576
  10. 324
  11. 270
  12. 350
  13. 266
  14. 240
  15. 840
  16. 336
  17. 564
  18. 416
  19. 672
  20. 364
  21. 300
  22. 462
  23. 480
  24. 322
  25. 195
  26. 504
  27. 672
  28. 574
  29. 252
  30. 168
  31. 288
  32. 198
  33. 300
  34. 264
  35. 294
  36. 816
  37. 648
  38. 238
  39. 315
  40. 154

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