Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 821 · 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. 1.45 × 12 =
2. 2.24 × 24 =
3. 3.49 × 18 =
4. 4.20 × 18 =
5. 5.15 × 18 =
6. 6.23 × 14 =
7. 7.28 × 15 =
8. 8.47 × 24 =
9. 9.35 × 24 =
10. 10.17 × 15 =
11. 11.19 × 18 =
12. 12.31 × 12 =
13. 13.14 × 18 =
14. 14.15 × 16 =
15. 15.14 × 14 =
16. 16.14 × 15 =
17. 17.19 × 15 =
18. 18.38 × 14 =
19. 19.29 × 18 =
20. 20.12 × 16 =
21. 21.33 × 12 =
22. 22.34 × 15 =
23. 23.39 × 12 =
24. 24.33 × 16 =
25. 25.17 × 14 =
26. 26.25 × 14 =
27. 27.13 × 12 =
28. 28.12 × 18 =
29. 29.18 × 15 =
30. 30.21 × 12 =
31. 31.20 × 15 =
32. 32.21 × 15 =
33. 33.16 × 12 =
34. 34.41 × 24 =
35. 35.47 × 12 =
36. 36.25 × 16 =
37. 37.42 × 16 =
38. 38.16 × 14 =
39. 39.46 × 12 =
40. 40.24 × 12 =

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