Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 341 · 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. 1.26 × 18 =
2. 2.13 × 12 =
3. 3.28 × 14 =
4. 4.41 × 15 =
5. 5.12 × 15 =
6. 6.12 × 16 =
7. 7.21 × 24 =
8. 8.38 × 15 =
9. 9.34 × 15 =
10. 10.48 × 16 =
11. 11.42 × 18 =
12. 12.30 × 15 =
13. 13.35 × 24 =
14. 14.35 × 14 =
15. 15.20 × 24 =
16. 16.27 × 24 =
17. 17.24 × 14 =
18. 18.27 × 12 =
19. 19.35 × 15 =
20. 20.22 × 14 =
21. 21.42 × 24 =
22. 22.45 × 15 =
23. 23.33 × 15 =
24. 24.29 × 15 =
25. 25.47 × 14 =
26. 26.13 × 16 =
27. 27.25 × 14 =
28. 28.19 × 18 =
29. 29.36 × 12 =
30. 30.24 × 12 =
31. 31.18 × 16 =
32. 32.32 × 16 =
33. 33.18 × 18 =
34. 34.31 × 14 =
35. 35.45 × 16 =
36. 36.17 × 24 =
37. 37.48 × 24 =
38. 38.12 × 14 =
39. 39.26 × 14 =
40. 40.45 × 14 =

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