Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 995 · 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 × 12 =
2. 2.15 × 14 =
3. 3.47 × 24 =
4. 4.12 × 24 =
5. 5.12 × 14 =
6. 6.43 × 12 =
7. 7.24 × 16 =
8. 8.25 × 12 =
9. 9.21 × 15 =
10. 10.15 × 12 =
11. 11.45 × 15 =
12. 12.26 × 16 =
13. 13.45 × 12 =
14. 14.22 × 18 =
15. 15.28 × 24 =
16. 16.13 × 12 =
17. 17.14 × 16 =
18. 18.26 × 18 =
19. 19.25 × 16 =
20. 20.32 × 14 =
21. 21.28 × 14 =
22. 22.39 × 12 =
23. 23.34 × 12 =
24. 24.15 × 18 =
25. 25.25 × 15 =
26. 26.11 × 24 =
27. 27.41 × 15 =
28. 28.12 × 18 =
29. 29.34 × 24 =
30. 30.32 × 12 =
31. 31.21 × 14 =
32. 32.48 × 16 =
33. 33.30 × 14 =
34. 34.24 × 15 =
35. 35.39 × 14 =
36. 36.37 × 24 =
37. 37.18 × 24 =
38. 38.33 × 14 =
39. 39.44 × 12 =
40. 40.13 × 15 =

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