Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 799 · 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. 1.27 × 24 =
2. 2.17 × 18 =
3. 3.38 × 12 =
4. 4.12 × 18 =
5. 5.39 × 24 =
6. 6.16 × 24 =
7. 7.22 × 15 =
8. 8.39 × 14 =
9. 9.48 × 15 =
10. 10.32 × 18 =
11. 11.28 × 24 =
12. 12.19 × 14 =
13. 13.34 × 12 =
14. 14.35 × 14 =
15. 15.26 × 15 =
16. 16.15 × 15 =
17. 17.40 × 18 =
18. 18.49 × 14 =
19. 19.31 × 14 =
20. 20.30 × 12 =
21. 21.47 × 12 =
22. 22.23 × 18 =
23. 23.20 × 14 =
24. 24.24 × 14 =
25. 25.24 × 18 =
26. 26.14 × 12 =
27. 27.17 × 14 =
28. 28.48 × 24 =
29. 29.23 × 14 =
30. 30.34 × 16 =
31. 31.30 × 18 =
32. 32.12 × 24 =
33. 33.26 × 18 =
34. 34.37 × 15 =
35. 35.26 × 12 =
36. 36.16 × 16 =
37. 37.17 × 24 =
38. 38.19 × 15 =
39. 39.35 × 15 =
40. 40.49 × 18 =

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