Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 90 · 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. 1.32 × 24 =
2. 2.49 × 14 =
3. 3.25 × 18 =
4. 4.24 × 24 =
5. 5.17 × 15 =
6. 6.49 × 16 =
7. 7.30 × 18 =
8. 8.21 × 24 =
9. 9.41 × 12 =
10. 10.19 × 16 =
11. 11.20 × 12 =
12. 12.22 × 14 =
13. 13.12 × 12 =
14. 14.24 × 15 =
15. 15.27 × 12 =
16. 16.15 × 15 =
17. 17.16 × 18 =
18. 18.36 × 15 =
19. 19.37 × 18 =
20. 20.49 × 24 =
21. 21.16 × 16 =
22. 22.44 × 16 =
23. 23.43 × 16 =
24. 24.42 × 16 =
25. 25.48 × 14 =
26. 26.46 × 15 =
27. 27.37 × 12 =
28. 28.39 × 12 =
29. 29.12 × 14 =
30. 30.47 × 24 =
31. 31.13 × 14 =
32. 32.34 × 16 =
33. 33.36 × 14 =
34. 34.45 × 12 =
35. 35.31 × 18 =
36. 36.49 × 12 =
37. 37.18 × 18 =
38. 38.14 × 18 =
39. 39.26 × 18 =
40. 40.27 × 18 =

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