Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 458 · 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 × 15 =
2. 2.45 × 18 =
3. 3.14 × 24 =
4. 4.15 × 18 =
5. 5.48 × 16 =
6. 6.28 × 24 =
7. 7.30 × 18 =
8. 8.11 × 15 =
9. 9.11 × 14 =
10. 10.22 × 15 =
11. 11.21 × 14 =
12. 12.30 × 16 =
13. 13.13 × 18 =
14. 14.14 × 14 =
15. 15.23 × 12 =
16. 16.30 × 14 =
17. 17.12 × 12 =
18. 18.25 × 12 =
19. 19.44 × 16 =
20. 20.18 × 14 =
21. 21.22 × 24 =
22. 22.28 × 16 =
23. 23.34 × 16 =
24. 24.35 × 24 =
25. 25.47 × 14 =
26. 26.45 × 24 =
27. 27.45 × 15 =
28. 28.18 × 12 =
29. 29.22 × 12 =
30. 30.20 × 12 =
31. 31.32 × 12 =
32. 32.49 × 18 =
33. 33.27 × 14 =
34. 34.27 × 18 =
35. 35.17 × 24 =
36. 36.35 × 15 =
37. 37.16 × 15 =
38. 38.43 × 14 =
39. 39.29 × 12 =
40. 40.40 × 15 =

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