Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 663 · 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. 1.27 × 12 =
2. 2.14 × 14 =
3. 3.49 × 12 =
4. 4.34 × 15 =
5. 5.13 × 15 =
6. 6.40 × 18 =
7. 7.24 × 18 =
8. 8.29 × 14 =
9. 9.48 × 14 =
10. 10.11 × 14 =
11. 11.18 × 12 =
12. 12.27 × 16 =
13. 13.30 × 18 =
14. 14.34 × 16 =
15. 15.23 × 18 =
16. 16.41 × 15 =
17. 17.11 × 12 =
18. 18.37 × 14 =
19. 19.32 × 16 =
20. 20.41 × 14 =
21. 21.19 × 24 =
22. 22.20 × 16 =
23. 23.49 × 16 =
24. 24.30 × 15 =
25. 25.22 × 16 =
26. 26.45 × 24 =
27. 27.28 × 14 =
28. 28.19 × 18 =
29. 29.30 × 12 =
30. 30.37 × 18 =
31. 31.15 × 12 =
32. 32.28 × 24 =
33. 33.26 × 14 =
34. 34.45 × 12 =
35. 35.11 × 15 =
36. 36.24 × 16 =
37. 37.12 × 18 =
38. 38.17 × 12 =
39. 39.37 × 24 =
40. 40.14 × 16 =

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