Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 367 · 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 × 12 =
2. 2.19 × 12 =
3. 3.12 × 15 =
4. 4.35 × 15 =
5. 5.12 × 12 =
6. 6.21 × 12 =
7. 7.16 × 15 =
8. 8.31 × 12 =
9. 9.27 × 12 =
10. 10.48 × 18 =
11. 11.47 × 18 =
12. 12.11 × 14 =
13. 13.29 × 16 =
14. 14.32 × 24 =
15. 15.12 × 14 =
16. 16.22 × 24 =
17. 17.25 × 16 =
18. 18.42 × 15 =
19. 19.17 × 12 =
20. 20.43 × 14 =
21. 21.29 × 24 =
22. 22.31 × 18 =
23. 23.35 × 24 =
24. 24.43 × 18 =
25. 25.13 × 12 =
26. 26.38 × 16 =
27. 27.38 × 18 =
28. 28.29 × 14 =
29. 29.22 × 12 =
30. 30.40 × 24 =
31. 31.48 × 24 =
32. 32.11 × 18 =
33. 33.41 × 18 =
34. 34.27 × 14 =
35. 35.46 × 16 =
36. 36.37 × 18 =
37. 37.36 × 15 =
38. 38.31 × 14 =
39. 39.42 × 18 =
40. 40.15 × 24 =

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