Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 381 · 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 × 18 =
2. 2.32 × 24 =
3. 3.32 × 12 =
4. 4.23 × 14 =
5. 5.24 × 18 =
6. 6.27 × 14 =
7. 7.16 × 24 =
8. 8.34 × 14 =
9. 9.16 × 16 =
10. 10.41 × 14 =
11. 11.12 × 15 =
12. 12.34 × 16 =
13. 13.25 × 18 =
14. 14.43 × 18 =
15. 15.36 × 16 =
16. 16.17 × 18 =
17. 17.35 × 14 =
18. 18.36 × 12 =
19. 19.48 × 15 =
20. 20.13 × 24 =
21. 21.36 × 15 =
22. 22.14 × 12 =
23. 23.49 × 16 =
24. 24.15 × 14 =
25. 25.38 × 18 =
26. 26.27 × 24 =
27. 27.18 × 12 =
28. 28.16 × 15 =
29. 29.46 × 24 =
30. 30.35 × 18 =
31. 31.12 × 16 =
32. 32.19 × 14 =
33. 33.31 × 24 =
34. 34.25 × 16 =
35. 35.12 × 12 =
36. 36.26 × 24 =
37. 37.37 × 15 =
38. 38.19 × 18 =
39. 39.22 × 18 =
40. 40.28 × 16 =

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