Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 104 · 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. 1.30 × 14 =
2. 2.49 × 16 =
3. 3.48 × 24 =
4. 4.49 × 12 =
5. 5.26 × 12 =
6. 6.25 × 16 =
7. 7.48 × 12 =
8. 8.14 × 15 =
9. 9.24 × 15 =
10. 10.18 × 14 =
11. 11.16 × 14 =
12. 12.32 × 18 =
13. 13.25 × 14 =
14. 14.16 × 24 =
15. 15.44 × 16 =
16. 16.29 × 24 =
17. 17.19 × 15 =
18. 18.46 × 12 =
19. 19.40 × 24 =
20. 20.46 × 24 =
21. 21.22 × 18 =
22. 22.14 × 14 =
23. 23.39 × 15 =
24. 24.40 × 12 =
25. 25.20 × 24 =
26. 26.34 × 14 =
27. 27.18 × 24 =
28. 28.25 × 18 =
29. 29.13 × 12 =
30. 30.42 × 24 =
31. 31.28 × 18 =
32. 32.27 × 16 =
33. 33.47 × 14 =
34. 34.11 × 14 =
35. 35.41 × 16 =
36. 36.12 × 18 =
37. 37.16 × 15 =
38. 38.17 × 18 =
39. 39.11 × 12 =
40. 40.15 × 14 =

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