← Factor chains for multiplying lesson New set →

Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 711 · 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. 1.42 × 12 =
  2. 2.47 × 14 =
  3. 3.39 × 12 =
  4. 4.30 × 12 =
  5. 5.41 × 16 =
  6. 6.23 × 14 =
  7. 7.28 × 18 =
  8. 8.20 × 12 =
  9. 9.12 × 15 =
  10. 10.30 × 14 =
  11. 11.24 × 18 =
  12. 12.41 × 15 =
  13. 13.28 × 14 =
  14. 14.19 × 12 =
  15. 15.34 × 14 =
  16. 16.47 × 12 =
  17. 17.20 × 16 =
  18. 18.36 × 14 =
  19. 19.45 × 12 =
  20. 20.44 × 18 =
  21. 21.22 × 15 =
  22. 22.35 × 15 =
  23. 23.11 × 18 =
  24. 24.46 × 12 =
  25. 25.15 × 12 =
  26. 26.41 × 18 =
  27. 27.13 × 24 =
  28. 28.43 × 18 =
  29. 29.47 × 18 =
  30. 30.49 × 16 =
  31. 31.12 × 24 =
  32. 32.31 × 12 =
  33. 33.28 × 16 =
  34. 34.14 × 18 =
  35. 35.20 × 15 =
  36. 36.11 × 12 =
  37. 37.23 × 15 =
  38. 38.25 × 12 =
  39. 39.11 × 24 =
  40. 40.44 × 14 =

Answer key

  1. 504
  2. 658
  3. 468
  4. 360
  5. 656
  6. 322
  7. 504
  8. 240
  9. 180
  10. 420
  11. 432
  12. 615
  13. 392
  14. 228
  15. 476
  16. 564
  17. 320
  18. 504
  19. 540
  20. 792
  21. 330
  22. 525
  23. 198
  24. 552
  25. 180
  26. 738
  27. 312
  28. 774
  29. 846
  30. 784
  31. 288
  32. 372
  33. 448
  34. 252
  35. 300
  36. 132
  37. 345
  38. 300
  39. 264
  40. 616

Free maths tricks lessons, practice and worksheets at talentjr.in/maths-tricks