Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 875 · 40 questions

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).

1. 1.11 × 15 =
2. 2.15 × 14 =
3. 3.34 × 12 =
4. 4.41 × 14 =
5. 5.49 × 24 =
6. 6.13 × 14 =
7. 7.14 × 14 =
8. 8.40 × 12 =
9. 9.20 × 18 =
10. 10.12 × 15 =
11. 11.31 × 12 =
12. 12.19 × 16 =
13. 13.36 × 16 =
14. 14.13 × 16 =
15. 15.41 × 12 =
16. 16.46 × 14 =
17. 17.19 × 15 =
18. 18.17 × 15 =
19. 19.42 × 12 =
20. 20.15 × 15 =
21. 21.14 × 16 =
22. 22.11 × 18 =
23. 23.26 × 12 =
24. 24.18 × 12 =
25. 25.28 × 18 =
26. 26.46 × 16 =
27. 27.29 × 18 =
28. 28.18 × 18 =
29. 29.15 × 12 =
30. 30.14 × 18 =
31. 31.43 × 15 =
32. 32.41 × 15 =
33. 33.45 × 16 =
34. 34.17 × 14 =
35. 35.24 × 12 =
36. 36.48 × 24 =
37. 37.22 × 18 =
38. 38.27 × 15 =
39. 39.14 × 24 =
40. 40.23 × 18 =

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