Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 91 · 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. 1.29 × 18 =
2. 2.30 × 24 =
3. 3.26 × 12 =
4. 4.44 × 12 =
5. 5.27 × 14 =
6. 6.29 × 12 =
7. 7.12 × 18 =
8. 8.37 × 14 =
9. 9.37 × 12 =
10. 10.20 × 15 =
11. 11.44 × 24 =
12. 12.20 × 12 =
13. 13.21 × 16 =
14. 14.25 × 15 =
15. 15.23 × 14 =
16. 16.32 × 12 =
17. 17.20 × 24 =
18. 18.44 × 18 =
19. 19.23 × 12 =
20. 20.41 × 24 =
21. 21.27 × 24 =
22. 22.42 × 14 =
23. 23.30 × 16 =
24. 24.20 × 14 =
25. 25.42 × 15 =
26. 26.13 × 12 =
27. 27.39 × 15 =
28. 28.11 × 12 =
29. 29.15 × 16 =
30. 30.17 × 15 =
31. 31.35 × 14 =
32. 32.20 × 16 =
33. 33.48 × 12 =
34. 34.19 × 15 =
35. 35.45 × 18 =
36. 36.16 × 16 =
37. 37.39 × 18 =
38. 38.22 × 12 =
39. 39.34 × 18 =
40. 40.46 × 14 =

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