Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 756 · 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 × 15 =
2. 2.45 × 18 =
3. 3.48 × 14 =
4. 4.32 × 24 =
5. 5.27 × 24 =
6. 6.42 × 12 =
7. 7.14 × 16 =
8. 8.21 × 15 =
9. 9.33 × 12 =
10. 10.34 × 18 =
11. 11.30 × 16 =
12. 12.17 × 14 =
13. 13.22 × 14 =
14. 14.48 × 18 =
15. 15.32 × 16 =
16. 16.34 × 15 =
17. 17.45 × 15 =
18. 18.41 × 12 =
19. 19.49 × 24 =
20. 20.44 × 15 =
21. 21.21 × 18 =
22. 22.19 × 16 =
23. 23.30 × 15 =
24. 24.27 × 15 =
25. 25.35 × 18 =
26. 26.43 × 12 =
27. 27.20 × 15 =
28. 28.32 × 15 =
29. 29.24 × 14 =
30. 30.26 × 18 =
31. 31.44 × 12 =
32. 32.46 × 12 =
33. 33.49 × 18 =
34. 34.41 × 16 =
35. 35.34 × 16 =
36. 36.18 × 16 =
37. 37.22 × 18 =
38. 38.13 × 14 =
39. 39.46 × 16 =
40. 40.19 × 24 =

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