Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 760 · 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. 1.38 × 18 =
2. 2.28 × 15 =
3. 3.28 × 12 =
4. 4.24 × 18 =
5. 5.30 × 18 =
6. 6.39 × 18 =
7. 7.38 × 12 =
8. 8.15 × 15 =
9. 9.17 × 18 =
10. 10.38 × 14 =
11. 11.30 × 15 =
12. 12.37 × 14 =
13. 13.12 × 15 =
14. 14.16 × 16 =
15. 15.22 × 24 =
16. 16.27 × 24 =
17. 17.13 × 12 =
18. 18.26 × 12 =
19. 19.39 × 24 =
20. 20.37 × 12 =
21. 21.41 × 18 =
22. 22.31 × 12 =
23. 23.35 × 14 =
24. 24.23 × 12 =
25. 25.46 × 24 =
26. 26.27 × 12 =
27. 27.13 × 16 =
28. 28.19 × 12 =
29. 29.18 × 15 =
30. 30.37 × 15 =
31. 31.29 × 12 =
32. 32.38 × 16 =
33. 33.20 × 12 =
34. 34.40 × 16 =
35. 35.12 × 18 =
36. 36.42 × 12 =
37. 37.21 × 12 =
38. 38.24 × 12 =
39. 39.34 × 24 =
40. 40.36 × 15 =

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