Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 863 · 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. 1.21 × 24 =
2. 2.45 × 18 =
3. 3.49 × 18 =
4. 4.14 × 12 =
5. 5.11 × 12 =
6. 6.12 × 18 =
7. 7.38 × 12 =
8. 8.18 × 24 =
9. 9.34 × 16 =
10. 10.47 × 15 =
11. 11.20 × 24 =
12. 12.27 × 15 =
13. 13.15 × 14 =
14. 14.17 × 16 =
15. 15.40 × 14 =
16. 16.41 × 15 =
17. 17.40 × 18 =
18. 18.35 × 14 =
19. 19.20 × 12 =
20. 20.25 × 16 =
21. 21.24 × 14 =
22. 22.30 × 14 =
23. 23.23 × 16 =
24. 24.27 × 24 =
25. 25.31 × 24 =
26. 26.47 × 16 =
27. 27.35 × 12 =
28. 28.16 × 15 =
29. 29.39 × 16 =
30. 30.19 × 24 =
31. 31.39 × 14 =
32. 32.16 × 14 =
33. 33.22 × 18 =
34. 34.17 × 18 =
35. 35.47 × 18 =
36. 36.48 × 18 =
37. 37.43 × 24 =
38. 38.35 × 15 =
39. 39.25 × 15 =
40. 40.16 × 16 =

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