Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 49 · 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 × 14 =
2. 2.16 × 12 =
3. 3.26 × 24 =
4. 4.41 × 16 =
5. 5.29 × 15 =
6. 6.17 × 15 =
7. 7.30 × 24 =
8. 8.14 × 16 =
9. 9.32 × 15 =
10. 10.27 × 14 =
11. 11.18 × 12 =
12. 12.36 × 24 =
13. 13.27 × 15 =
14. 14.28 × 16 =
15. 15.25 × 12 =
16. 16.49 × 24 =
17. 17.28 × 15 =
18. 18.28 × 12 =
19. 19.40 × 18 =
20. 20.38 × 16 =
21. 21.34 × 15 =
22. 22.13 × 24 =
23. 23.37 × 16 =
24. 24.30 × 12 =
25. 25.17 × 12 =
26. 26.22 × 16 =
27. 27.19 × 12 =
28. 28.41 × 24 =
29. 29.24 × 15 =
30. 30.37 × 24 =
31. 31.36 × 16 =
32. 32.27 × 24 =
33. 33.25 × 14 =
34. 34.30 × 15 =
35. 35.23 × 12 =
36. 36.19 × 24 =
37. 37.30 × 14 =
38. 38.48 × 15 =
39. 39.26 × 12 =
40. 40.49 × 14 =

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