Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 833 · 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. 1.14 × 14 =
2. 2.41 × 15 =
3. 3.38 × 12 =
4. 4.36 × 15 =
5. 5.20 × 14 =
6. 6.37 × 24 =
7. 7.22 × 18 =
8. 8.12 × 14 =
9. 9.38 × 14 =
10. 10.20 × 18 =
11. 11.22 × 24 =
12. 12.25 × 15 =
13. 13.15 × 16 =
14. 14.34 × 24 =
15. 15.21 × 18 =
16. 16.41 × 12 =
17. 17.23 × 15 =
18. 18.18 × 24 =
19. 19.25 × 14 =
20. 20.38 × 15 =
21. 21.46 × 12 =
22. 22.45 × 15 =
23. 23.12 × 12 =
24. 24.16 × 24 =
25. 25.32 × 12 =
26. 26.35 × 24 =
27. 27.32 × 16 =
28. 28.49 × 16 =
29. 29.34 × 16 =
30. 30.48 × 18 =
31. 31.35 × 14 =
32. 32.21 × 14 =
33. 33.17 × 14 =
34. 34.49 × 14 =
35. 35.42 × 16 =
36. 36.23 × 18 =
37. 37.19 × 14 =
38. 38.42 × 12 =
39. 39.14 × 12 =
40. 40.46 × 24 =

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