Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 26 · 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. 1.30 × 12 =
2. 2.43 × 24 =
3. 3.12 × 15 =
4. 4.19 × 16 =
5. 5.45 × 14 =
6. 6.43 × 14 =
7. 7.23 × 24 =
8. 8.15 × 18 =
9. 9.17 × 18 =
10. 10.37 × 15 =
11. 11.32 × 15 =
12. 12.44 × 18 =
13. 13.11 × 15 =
14. 14.45 × 16 =
15. 15.25 × 15 =
16. 16.38 × 12 =
17. 17.16 × 15 =
18. 18.42 × 12 =
19. 19.36 × 12 =
20. 20.36 × 14 =
21. 21.42 × 15 =
22. 22.11 × 12 =
23. 23.47 × 18 =
24. 24.18 × 16 =
25. 25.47 × 15 =
26. 26.33 × 12 =
27. 27.11 × 14 =
28. 28.45 × 15 =
29. 29.18 × 15 =
30. 30.39 × 12 =
31. 31.18 × 12 =
32. 32.43 × 12 =
33. 33.20 × 24 =
34. 34.47 × 12 =
35. 35.49 × 18 =
36. 36.24 × 15 =
37. 37.28 × 15 =
38. 38.28 × 12 =
39. 39.15 × 12 =
40. 40.12 × 18 =

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