Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 407 · 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. 1.13 × 18 =
2. 2.40 × 16 =
3. 3.15 × 18 =
4. 4.34 × 14 =
5. 5.42 × 12 =
6. 6.20 × 12 =
7. 7.25 × 18 =
8. 8.40 × 15 =
9. 9.38 × 15 =
10. 10.28 × 15 =
11. 11.19 × 12 =
12. 12.41 × 14 =
13. 13.28 × 18 =
14. 14.18 × 16 =
15. 15.18 × 12 =
16. 16.30 × 12 =
17. 17.33 × 14 =
18. 18.49 × 12 =
19. 19.46 × 12 =
20. 20.17 × 15 =
21. 21.29 × 14 =
22. 22.27 × 15 =
23. 23.16 × 16 =
24. 24.24 × 24 =
25. 25.38 × 18 =
26. 26.42 × 24 =
27. 27.18 × 14 =
28. 28.31 × 24 =
29. 29.26 × 12 =
30. 30.43 × 12 =
31. 31.18 × 18 =
32. 32.18 × 24 =
33. 33.15 × 24 =
34. 34.34 × 12 =
35. 35.14 × 12 =
36. 36.46 × 14 =
37. 37.24 × 12 =
38. 38.35 × 12 =
39. 39.14 × 14 =
40. 40.20 × 15 =

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