Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 562 · 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. 1.22 × 24 =
2. 2.12 × 18 =
3. 3.30 × 12 =
4. 4.32 × 14 =
5. 5.38 × 15 =
6. 6.16 × 14 =
7. 7.18 × 15 =
8. 8.44 × 16 =
9. 9.40 × 18 =
10. 10.20 × 15 =
11. 11.35 × 24 =
12. 12.42 × 12 =
13. 13.37 × 16 =
14. 14.22 × 15 =
15. 15.21 × 24 =
16. 16.19 × 15 =
17. 17.42 × 24 =
18. 18.31 × 24 =
19. 19.37 × 12 =
20. 20.30 × 15 =
21. 21.25 × 12 =
22. 22.27 × 14 =
23. 23.38 × 16 =
24. 24.44 × 14 =
25. 25.42 × 14 =
26. 26.41 × 16 =
27. 27.45 × 24 =
28. 28.28 × 12 =
29. 29.14 × 14 =
30. 30.42 × 16 =
31. 31.20 × 24 =
32. 32.32 × 16 =
33. 33.13 × 15 =
34. 34.47 × 18 =
35. 35.24 × 24 =
36. 36.41 × 14 =
37. 37.49 × 15 =
38. 38.23 × 14 =
39. 39.21 × 18 =
40. 40.18 × 12 =

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