Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 268 · 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. 1.23 × 12 =
2. 2.20 × 15 =
3. 3.13 × 24 =
4. 4.27 × 16 =
5. 5.13 × 14 =
6. 6.38 × 12 =
7. 7.25 × 16 =
8. 8.15 × 16 =
9. 9.48 × 14 =
10. 10.43 × 15 =
11. 11.15 × 24 =
12. 12.41 × 14 =
13. 13.21 × 18 =
14. 14.28 × 15 =
15. 15.16 × 18 =
16. 16.18 × 14 =
17. 17.38 × 16 =
18. 18.30 × 15 =
19. 19.12 × 14 =
20. 20.35 × 14 =
21. 21.24 × 15 =
22. 22.41 × 16 =
23. 23.34 × 12 =
24. 24.17 × 12 =
25. 25.27 × 12 =
26. 26.37 × 14 =
27. 27.47 × 12 =
28. 28.45 × 14 =
29. 29.24 × 12 =
30. 30.29 × 14 =
31. 31.26 × 14 =
32. 32.37 × 24 =
33. 33.42 × 12 =
34. 34.40 × 15 =
35. 35.21 × 12 =
36. 36.29 × 16 =
37. 37.45 × 12 =
38. 38.35 × 18 =
39. 39.17 × 16 =
40. 40.37 × 18 =

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