Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 335 · 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. 1.14 × 24 =
2. 2.23 × 18 =
3. 3.17 × 15 =
4. 4.49 × 16 =
5. 5.19 × 18 =
6. 6.22 × 14 =
7. 7.29 × 24 =
8. 8.12 × 16 =
9. 9.26 × 15 =
10. 10.21 × 15 =
11. 11.45 × 18 =
12. 12.11 × 18 =
13. 13.24 × 15 =
14. 14.39 × 16 =
15. 15.41 × 14 =
16. 16.49 × 18 =
17. 17.42 × 14 =
18. 18.35 × 18 =
19. 19.19 × 15 =
20. 20.24 × 24 =
21. 21.22 × 24 =
22. 22.33 × 14 =
23. 23.40 × 12 =
24. 24.24 × 12 =
25. 25.21 × 12 =
26. 26.11 × 15 =
27. 27.46 × 24 =
28. 28.40 × 18 =
29. 29.37 × 16 =
30. 30.12 × 12 =
31. 31.19 × 14 =
32. 32.23 × 15 =
33. 33.40 × 24 =
34. 34.32 × 16 =
35. 35.15 × 18 =
36. 36.42 × 12 =
37. 37.31 × 14 =
38. 38.20 × 14 =
39. 39.35 × 12 =
40. 40.38 × 16 =

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