Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 720 · 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. 1.25 × 18 =
2. 2.23 × 18 =
3. 3.43 × 18 =
4. 4.11 × 14 =
5. 5.36 × 15 =
6. 6.31 × 15 =
7. 7.26 × 24 =
8. 8.14 × 18 =
9. 9.34 × 15 =
10. 10.35 × 12 =
11. 11.15 × 18 =
12. 12.23 × 12 =
13. 13.37 × 18 =
14. 14.21 × 12 =
15. 15.20 × 16 =
16. 16.40 × 24 =
17. 17.32 × 24 =
18. 18.20 × 14 =
19. 19.39 × 15 =
20. 20.20 × 15 =
21. 21.18 × 18 =
22. 22.19 × 16 =
23. 23.45 × 12 =
24. 24.26 × 16 =
25. 25.27 × 24 =
26. 26.32 × 18 =
27. 27.46 × 12 =
28. 28.31 × 24 =
29. 29.43 × 14 =
30. 30.49 × 12 =
31. 31.36 × 12 =
32. 32.37 × 12 =
33. 33.35 × 16 =
34. 34.29 × 15 =
35. 35.18 × 12 =
36. 36.37 × 14 =
37. 37.12 × 14 =
38. 38.24 × 14 =
39. 39.15 × 24 =
40. 40.27 × 16 =

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