Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 248 · 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 × 18 =
2. 2.13 × 14 =
3. 3.36 × 12 =
4. 4.16 × 15 =
5. 5.37 × 24 =
6. 6.11 × 24 =
7. 7.19 × 12 =
8. 8.49 × 14 =
9. 9.22 × 14 =
10. 10.22 × 12 =
11. 11.14 × 14 =
12. 12.15 × 24 =
13. 13.13 × 24 =
14. 14.26 × 24 =
15. 15.23 × 16 =
16. 16.35 × 24 =
17. 17.41 × 15 =
18. 18.18 × 15 =
19. 19.27 × 12 =
20. 20.49 × 24 =
21. 21.26 × 18 =
22. 22.30 × 16 =
23. 23.39 × 12 =
24. 24.25 × 24 =
25. 25.28 × 15 =
26. 26.18 × 14 =
27. 27.15 × 15 =
28. 28.17 × 15 =
29. 29.27 × 15 =
30. 30.13 × 15 =
31. 31.32 × 12 =
32. 32.45 × 12 =
33. 33.17 × 18 =
34. 34.33 × 12 =
35. 35.12 × 14 =
36. 36.20 × 12 =
37. 37.34 × 12 =
38. 38.21 × 12 =
39. 39.37 × 18 =
40. 40.15 × 12 =

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