Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 28 · 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. 1.22 × 18 =
2. 2.48 × 18 =
3. 3.33 × 15 =
4. 4.11 × 16 =
5. 5.13 × 15 =
6. 6.40 × 14 =
7. 7.16 × 18 =
8. 8.17 × 16 =
9. 9.25 × 16 =
10. 10.14 × 24 =
11. 11.27 × 15 =
12. 12.18 × 16 =
13. 13.22 × 12 =
14. 14.13 × 12 =
15. 15.11 × 18 =
16. 16.21 × 24 =
17. 17.12 × 12 =
18. 18.32 × 14 =
19. 19.48 × 24 =
20. 20.34 × 12 =
21. 21.18 × 18 =
22. 22.41 × 12 =
23. 23.20 × 14 =
24. 24.25 × 18 =
25. 25.28 × 14 =
26. 26.13 × 18 =
27. 27.45 × 14 =
28. 28.11 × 12 =
29. 29.33 × 14 =
30. 30.48 × 14 =
31. 31.26 × 24 =
32. 32.31 × 16 =
33. 33.42 × 18 =
34. 34.42 × 14 =
35. 35.16 × 24 =
36. 36.21 × 12 =
37. 37.37 × 16 =
38. 38.30 × 14 =
39. 39.45 × 15 =
40. 40.12 × 16 =

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