Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 169 · 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. 1.38 × 24 =
2. 2.45 × 18 =
3. 3.37 × 14 =
4. 4.24 × 18 =
5. 5.29 × 16 =
6. 6.30 × 12 =
7. 7.22 × 14 =
8. 8.34 × 14 =
9. 9.14 × 15 =
10. 10.25 × 15 =
11. 11.32 × 18 =
12. 12.37 × 15 =
13. 13.25 × 16 =
14. 14.39 × 12 =
15. 15.38 × 15 =
16. 16.36 × 15 =
17. 17.28 × 14 =
18. 18.16 × 15 =
19. 19.23 × 12 =
20. 20.40 × 16 =
21. 21.24 × 14 =
22. 22.34 × 16 =
23. 23.20 × 14 =
24. 24.42 × 14 =
25. 25.19 × 24 =
26. 26.21 × 18 =
27. 27.17 × 16 =
28. 28.45 × 15 =
29. 29.44 × 15 =
30. 30.11 × 14 =
31. 31.42 × 12 =
32. 32.25 × 24 =
33. 33.38 × 16 =
34. 34.33 × 16 =
35. 35.18 × 24 =
36. 36.42 × 18 =
37. 37.29 × 24 =
38. 38.31 × 14 =
39. 39.21 × 12 =
40. 40.39 × 15 =

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