Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 25 · 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. 1.30 × 12 =
2. 2.40 × 18 =
3. 3.49 × 14 =
4. 4.12 × 16 =
5. 5.20 × 12 =
6. 6.37 × 16 =
7. 7.34 × 18 =
8. 8.42 × 16 =
9. 9.22 × 14 =
10. 10.35 × 18 =
11. 11.48 × 16 =
12. 12.32 × 15 =
13. 13.39 × 12 =
14. 14.11 × 12 =
15. 15.45 × 12 =
16. 16.22 × 12 =
17. 17.35 × 14 =
18. 18.27 × 16 =
19. 19.26 × 16 =
20. 20.20 × 15 =
21. 21.13 × 15 =
22. 22.38 × 16 =
23. 23.40 × 16 =
24. 24.15 × 12 =
25. 25.19 × 12 =
26. 26.40 × 15 =
27. 27.12 × 15 =
28. 28.48 × 15 =
29. 29.26 × 12 =
30. 30.23 × 12 =
31. 31.17 × 16 =
32. 32.22 × 15 =
33. 33.38 × 24 =
34. 34.14 × 24 =
35. 35.36 × 16 =
36. 36.18 × 15 =
37. 37.46 × 12 =
38. 38.17 × 12 =
39. 39.49 × 18 =
40. 40.33 × 18 =

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