Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 372 · 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. 1.31 × 12 =
2. 2.17 × 12 =
3. 3.12 × 18 =
4. 4.45 × 16 =
5. 5.18 × 24 =
6. 6.15 × 14 =
7. 7.13 × 18 =
8. 8.30 × 16 =
9. 9.27 × 12 =
10. 10.49 × 15 =
11. 11.16 × 12 =
12. 12.42 × 14 =
13. 13.26 × 18 =
14. 14.44 × 12 =
15. 15.21 × 15 =
16. 16.16 × 16 =
17. 17.35 × 15 =
18. 18.39 × 24 =
19. 19.36 × 18 =
20. 20.36 × 14 =
21. 21.42 × 18 =
22. 22.22 × 14 =
23. 23.38 × 24 =
24. 24.13 × 16 =
25. 25.21 × 14 =
26. 26.44 × 16 =
27. 27.41 × 15 =
28. 28.41 × 12 =
29. 29.26 × 15 =
30. 30.35 × 18 =
31. 31.47 × 14 =
32. 32.47 × 15 =
33. 33.39 × 12 =
34. 34.19 × 16 =
35. 35.15 × 15 =
36. 36.34 × 12 =
37. 37.33 × 18 =
38. 38.25 × 14 =
39. 39.37 × 14 =
40. 40.46 × 24 =

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