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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 767 · 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. 1.25 × 16 =
  2. 2.49 × 14 =
  3. 3.24 × 12 =
  4. 4.47 × 15 =
  5. 5.29 × 24 =
  6. 6.27 × 14 =
  7. 7.12 × 14 =
  8. 8.11 × 15 =
  9. 9.44 × 24 =
  10. 10.34 × 18 =
  11. 11.23 × 12 =
  12. 12.21 × 14 =
  13. 13.22 × 14 =
  14. 14.11 × 24 =
  15. 15.44 × 15 =
  16. 16.14 × 24 =
  17. 17.25 × 24 =
  18. 18.34 × 14 =
  19. 19.24 × 15 =
  20. 20.14 × 12 =
  21. 21.27 × 24 =
  22. 22.24 × 16 =
  23. 23.28 × 24 =
  24. 24.20 × 16 =
  25. 25.19 × 24 =
  26. 26.14 × 15 =
  27. 27.29 × 18 =
  28. 28.11 × 18 =
  29. 29.21 × 24 =
  30. 30.36 × 12 =
  31. 31.47 × 24 =
  32. 32.14 × 16 =
  33. 33.13 × 12 =
  34. 34.22 × 15 =
  35. 35.25 × 14 =
  36. 36.26 × 14 =
  37. 37.13 × 16 =
  38. 38.30 × 24 =
  39. 39.32 × 15 =
  40. 40.17 × 16 =

Answer key

  1. 400
  2. 686
  3. 288
  4. 705
  5. 696
  6. 378
  7. 168
  8. 165
  9. 1056
  10. 612
  11. 276
  12. 294
  13. 308
  14. 264
  15. 660
  16. 336
  17. 600
  18. 476
  19. 360
  20. 168
  21. 648
  22. 384
  23. 672
  24. 320
  25. 456
  26. 210
  27. 522
  28. 198
  29. 504
  30. 432
  31. 1128
  32. 224
  33. 156
  34. 330
  35. 350
  36. 364
  37. 208
  38. 720
  39. 480
  40. 272

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