Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 280 · 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. 1.16 × 18 =
2. 2.23 × 15 =
3. 3.22 × 16 =
4. 4.43 × 12 =
5. 5.34 × 15 =
6. 6.24 × 14 =
7. 7.44 × 12 =
8. 8.33 × 12 =
9. 9.18 × 14 =
10. 10.44 × 14 =
11. 11.32 × 14 =
12. 12.19 × 14 =
13. 13.22 × 12 =
14. 14.12 × 12 =
15. 15.21 × 16 =
16. 16.39 × 24 =
17. 17.11 × 18 =
18. 18.49 × 14 =
19. 19.40 × 12 =
20. 20.20 × 12 =
21. 21.27 × 12 =
22. 22.47 × 16 =
23. 23.27 × 18 =
24. 24.26 × 18 =
25. 25.35 × 24 =
26. 26.47 × 12 =
27. 27.31 × 15 =
28. 28.44 × 18 =
29. 29.17 × 16 =
30. 30.38 × 12 =
31. 31.48 × 16 =
32. 32.25 × 18 =
33. 33.18 × 18 =
34. 34.14 × 12 =
35. 35.15 × 14 =
36. 36.42 × 14 =
37. 37.26 × 16 =
38. 38.25 × 14 =
39. 39.35 × 12 =
40. 40.31 × 18 =

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