Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 650 · 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 × 16 =
2. 2.12 × 15 =
3. 3.20 × 15 =
4. 4.15 × 18 =
5. 5.15 × 15 =
6. 6.17 × 16 =
7. 7.46 × 16 =
8. 8.34 × 16 =
9. 9.16 × 24 =
10. 10.31 × 18 =
11. 11.37 × 14 =
12. 12.19 × 15 =
13. 13.28 × 24 =
14. 14.11 × 12 =
15. 15.14 × 14 =
16. 16.15 × 24 =
17. 17.24 × 18 =
18. 18.35 × 15 =
19. 19.29 × 24 =
20. 20.23 × 24 =
21. 21.18 × 12 =
22. 22.22 × 15 =
23. 23.19 × 24 =
24. 24.47 × 16 =
25. 25.14 × 15 =
26. 26.40 × 18 =
27. 27.26 × 18 =
28. 28.39 × 24 =
29. 29.44 × 24 =
30. 30.17 × 14 =
31. 31.35 × 18 =
32. 32.11 × 15 =
33. 33.33 × 14 =
34. 34.20 × 16 =
35. 35.37 × 15 =
36. 36.42 × 15 =
37. 37.44 × 16 =
38. 38.34 × 14 =
39. 39.16 × 18 =
40. 40.39 × 16 =

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