Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 277 · 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. 2.20 × 24 =
3. 3.16 × 24 =
4. 4.49 × 14 =
5. 5.19 × 16 =
6. 6.21 × 24 =
7. 7.29 × 12 =
8. 8.35 × 24 =
9. 9.40 × 24 =
10. 10.41 × 18 =
11. 11.43 × 14 =
12. 12.14 × 14 =
13. 13.40 × 12 =
14. 14.27 × 18 =
15. 15.43 × 16 =
16. 16.43 × 18 =
17. 17.31 × 12 =
18. 18.13 × 14 =
19. 19.33 × 18 =
20. 20.44 × 12 =
21. 21.21 × 12 =
22. 22.15 × 16 =
23. 23.36 × 15 =
24. 24.15 × 14 =
25. 25.20 × 15 =
26. 26.34 × 14 =
27. 27.38 × 12 =
28. 28.40 × 15 =
29. 29.17 × 18 =
30. 30.37 × 15 =
31. 31.37 × 24 =
32. 32.38 × 16 =
33. 33.13 × 24 =
34. 34.18 × 24 =
35. 35.41 × 15 =
36. 36.16 × 12 =
37. 37.22 × 15 =
38. 38.24 × 18 =
39. 39.23 × 24 =
40. 40.41 × 12 =

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