Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 795 · 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. 1.17 × 15 =
2. 2.49 × 24 =
3. 3.46 × 18 =
4. 4.34 × 12 =
5. 5.12 × 24 =
6. 6.35 × 12 =
7. 7.24 × 16 =
8. 8.11 × 12 =
9. 9.38 × 18 =
10. 10.35 × 18 =
11. 11.26 × 18 =
12. 12.49 × 18 =
13. 13.41 × 15 =
14. 14.18 × 12 =
15. 15.31 × 16 =
16. 16.18 × 15 =
17. 17.33 × 15 =
18. 18.14 × 12 =
19. 19.20 × 24 =
20. 20.11 × 15 =
21. 21.14 × 15 =
22. 22.21 × 24 =
23. 23.46 × 15 =
24. 24.28 × 12 =
25. 25.22 × 12 =
26. 26.14 × 18 =
27. 27.42 × 24 =
28. 28.27 × 18 =
29. 29.28 × 14 =
30. 30.11 × 14 =
31. 31.40 × 24 =
32. 32.33 × 12 =
33. 33.12 × 18 =
34. 34.38 × 12 =
35. 35.27 × 24 =
36. 36.16 × 12 =
37. 37.21 × 12 =
38. 38.49 × 12 =
39. 39.17 × 18 =
40. 40.47 × 24 =

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