← Factor chains for multiplying lesson New set →

Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 155 · 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. 1.34 × 24 =
  2. 2.25 × 15 =
  3. 3.12 × 12 =
  4. 4.15 × 12 =
  5. 5.32 × 24 =
  6. 6.11 × 12 =
  7. 7.44 × 14 =
  8. 8.21 × 24 =
  9. 9.26 × 16 =
  10. 10.45 × 16 =
  11. 11.24 × 15 =
  12. 12.37 × 18 =
  13. 13.44 × 12 =
  14. 14.34 × 12 =
  15. 15.16 × 24 =
  16. 16.21 × 15 =
  17. 17.31 × 24 =
  18. 18.32 × 18 =
  19. 19.17 × 14 =
  20. 20.28 × 24 =
  21. 21.30 × 16 =
  22. 22.17 × 15 =
  23. 23.36 × 15 =
  24. 24.26 × 24 =
  25. 25.49 × 18 =
  26. 26.48 × 12 =
  27. 27.40 × 14 =
  28. 28.36 × 18 =
  29. 29.27 × 14 =
  30. 30.13 × 14 =
  31. 31.19 × 24 =
  32. 32.27 × 18 =
  33. 33.24 × 24 =
  34. 34.42 × 18 =
  35. 35.18 × 15 =
  36. 36.39 × 15 =
  37. 37.46 × 12 =
  38. 38.39 × 16 =
  39. 39.28 × 16 =
  40. 40.21 × 14 =

Answer key

  1. 816
  2. 375
  3. 144
  4. 180
  5. 768
  6. 132
  7. 616
  8. 504
  9. 416
  10. 720
  11. 360
  12. 666
  13. 528
  14. 408
  15. 384
  16. 315
  17. 744
  18. 576
  19. 238
  20. 672
  21. 480
  22. 255
  23. 540
  24. 624
  25. 882
  26. 576
  27. 560
  28. 648
  29. 378
  30. 182
  31. 456
  32. 486
  33. 576
  34. 756
  35. 270
  36. 585
  37. 552
  38. 624
  39. 448
  40. 294

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