Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 393 · 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. 1.23 × 12 =
2. 2.25 × 16 =
3. 3.15 × 12 =
4. 4.30 × 14 =
5. 5.22 × 15 =
6. 6.21 × 15 =
7. 7.36 × 24 =
8. 8.36 × 14 =
9. 9.23 × 14 =
10. 10.47 × 16 =
11. 11.19 × 12 =
12. 12.24 × 24 =
13. 13.28 × 12 =
14. 14.46 × 14 =
15. 15.14 × 14 =
16. 16.20 × 15 =
17. 17.45 × 24 =
18. 18.27 × 18 =
19. 19.29 × 15 =
20. 20.18 × 15 =
21. 21.12 × 18 =
22. 22.18 × 12 =
23. 23.15 × 24 =
24. 24.25 × 18 =
25. 25.49 × 16 =
26. 26.39 × 14 =
27. 27.42 × 12 =
28. 28.18 × 18 =
29. 29.34 × 18 =
30. 30.12 × 24 =
31. 31.24 × 12 =
32. 32.11 × 15 =
33. 33.14 × 16 =
34. 34.43 × 14 =
35. 35.35 × 18 =
36. 36.18 × 16 =
37. 37.20 × 14 =
38. 38.14 × 12 =
39. 39.13 × 18 =
40. 40.16 × 12 =

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