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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 729 · 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. 1.21 × 16 =
  2. 2.40 × 14 =
  3. 3.47 × 16 =
  4. 4.34 × 12 =
  5. 5.43 × 16 =
  6. 6.41 × 14 =
  7. 7.14 × 14 =
  8. 8.44 × 15 =
  9. 9.40 × 15 =
  10. 10.41 × 16 =
  11. 11.41 × 12 =
  12. 12.43 × 18 =
  13. 13.35 × 18 =
  14. 14.13 × 15 =
  15. 15.30 × 14 =
  16. 16.23 × 15 =
  17. 17.30 × 15 =
  18. 18.16 × 12 =
  19. 19.19 × 12 =
  20. 20.44 × 12 =
  21. 21.32 × 15 =
  22. 22.20 × 16 =
  23. 23.12 × 12 =
  24. 24.11 × 12 =
  25. 25.45 × 14 =
  26. 26.15 × 18 =
  27. 27.29 × 14 =
  28. 28.25 × 12 =
  29. 29.32 × 24 =
  30. 30.14 × 12 =
  31. 31.43 × 12 =
  32. 32.18 × 16 =
  33. 33.36 × 18 =
  34. 34.34 × 14 =
  35. 35.16 × 24 =
  36. 36.31 × 15 =
  37. 37.37 × 14 =
  38. 38.35 × 24 =
  39. 39.24 × 15 =
  40. 40.35 × 14 =

Answer key

  1. 336
  2. 560
  3. 752
  4. 408
  5. 688
  6. 574
  7. 196
  8. 660
  9. 600
  10. 656
  11. 492
  12. 774
  13. 630
  14. 195
  15. 420
  16. 345
  17. 450
  18. 192
  19. 228
  20. 528
  21. 480
  22. 320
  23. 144
  24. 132
  25. 630
  26. 270
  27. 406
  28. 300
  29. 768
  30. 168
  31. 516
  32. 288
  33. 648
  34. 476
  35. 384
  36. 465
  37. 518
  38. 840
  39. 360
  40. 490

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