Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 696 · 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. 1.36 × 12 =
2. 2.35 × 24 =
3. 3.11 × 24 =
4. 4.28 × 24 =
5. 5.32 × 12 =
6. 6.16 × 14 =
7. 7.19 × 18 =
8. 8.23 × 15 =
9. 9.26 × 14 =
10. 10.15 × 18 =
11. 11.46 × 18 =
12. 12.37 × 15 =
13. 13.25 × 18 =
14. 14.18 × 18 =
15. 15.38 × 15 =
16. 16.15 × 24 =
17. 17.49 × 14 =
18. 18.18 × 16 =
19. 19.16 × 12 =
20. 20.26 × 24 =
21. 21.22 × 18 =
22. 22.38 × 24 =
23. 23.21 × 15 =
24. 24.32 × 16 =
25. 25.46 × 24 =
26. 26.11 × 14 =
27. 27.25 × 14 =
28. 28.20 × 12 =
29. 29.20 × 16 =
30. 30.13 × 15 =
31. 31.41 × 15 =
32. 32.30 × 15 =
33. 33.33 × 16 =
34. 34.12 × 24 =
35. 35.26 × 18 =
36. 36.43 × 14 =
37. 37.30 × 24 =
38. 38.40 × 18 =
39. 39.39 × 16 =
40. 40.34 × 18 =

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