Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 345 · 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 × 24 =
2. 2.44 × 14 =
3. 3.23 × 12 =
4. 4.32 × 12 =
5. 5.12 × 12 =
6. 6.19 × 12 =
7. 7.35 × 12 =
8. 8.13 × 24 =
9. 9.21 × 15 =
10. 10.28 × 15 =
11. 11.49 × 18 =
12. 12.18 × 12 =
13. 13.22 × 15 =
14. 14.44 × 18 =
15. 15.11 × 15 =
16. 16.30 × 15 =
17. 17.11 × 14 =
18. 18.46 × 24 =
19. 19.12 × 24 =
20. 20.45 × 24 =
21. 21.14 × 16 =
22. 22.48 × 12 =
23. 23.22 × 18 =
24. 24.17 × 18 =
25. 25.49 × 15 =
26. 26.32 × 24 =
27. 27.26 × 18 =
28. 28.38 × 15 =
29. 29.43 × 18 =
30. 30.48 × 24 =
31. 31.46 × 12 =
32. 32.16 × 16 =
33. 33.33 × 12 =
34. 34.21 × 16 =
35. 35.31 × 18 =
36. 36.20 × 14 =
37. 37.20 × 16 =
38. 38.46 × 16 =
39. 39.20 × 24 =
40. 40.28 × 14 =

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