Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 815 · 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. 1.16 × 18 =
2. 2.49 × 12 =
3. 3.34 × 18 =
4. 4.33 × 12 =
5. 5.39 × 14 =
6. 6.17 × 16 =
7. 7.44 × 12 =
8. 8.46 × 14 =
9. 9.32 × 16 =
10. 10.23 × 14 =
11. 11.44 × 15 =
12. 12.32 × 14 =
13. 13.37 × 15 =
14. 14.22 × 16 =
15. 15.19 × 14 =
16. 16.24 × 18 =
17. 17.33 × 14 =
18. 18.29 × 12 =
19. 19.48 × 14 =
20. 20.41 × 14 =
21. 21.31 × 15 =
22. 22.37 × 14 =
23. 23.44 × 18 =
24. 24.37 × 16 =
25. 25.14 × 18 =
26. 26.46 × 12 =
27. 27.47 × 12 =
28. 28.16 × 12 =
29. 29.11 × 18 =
30. 30.18 × 12 =
31. 31.25 × 16 =
32. 32.34 × 14 =
33. 33.26 × 18 =
34. 34.21 × 14 =
35. 35.22 × 24 =
36. 36.29 × 24 =
37. 37.20 × 14 =
38. 38.39 × 12 =
39. 39.17 × 12 =
40. 40.12 × 24 =

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