Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 638 · 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. 1.35 × 15 =
2. 2.17 × 24 =
3. 3.23 × 12 =
4. 4.22 × 16 =
5. 5.22 × 24 =
6. 6.37 × 12 =
7. 7.38 × 16 =
8. 8.37 × 24 =
9. 9.46 × 16 =
10. 10.15 × 24 =
11. 11.36 × 12 =
12. 12.23 × 15 =
13. 13.48 × 24 =
14. 14.17 × 16 =
15. 15.21 × 16 =
16. 16.20 × 14 =
17. 17.13 × 24 =
18. 18.29 × 12 =
19. 19.39 × 14 =
20. 20.21 × 14 =
21. 21.25 × 12 =
22. 22.18 × 16 =
23. 23.41 × 24 =
24. 24.42 × 15 =
25. 25.37 × 18 =
26. 26.42 × 14 =
27. 27.19 × 12 =
28. 28.13 × 18 =
29. 29.32 × 12 =
30. 30.30 × 15 =
31. 31.44 × 12 =
32. 32.14 × 12 =
33. 33.32 × 18 =
34. 34.33 × 24 =
35. 35.46 × 18 =
36. 36.19 × 14 =
37. 37.43 × 12 =
38. 38.20 × 18 =
39. 39.16 × 24 =
40. 40.22 × 14 =

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