Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 750 · 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. 1.25 × 16 =
2. 2.15 × 12 =
3. 3.49 × 18 =
4. 4.44 × 14 =
5. 5.45 × 15 =
6. 6.27 × 18 =
7. 7.16 × 12 =
8. 8.27 × 16 =
9. 9.30 × 14 =
10. 10.20 × 16 =
11. 11.14 × 24 =
12. 12.19 × 18 =
13. 13.17 × 24 =
14. 14.11 × 24 =
15. 15.14 × 16 =
16. 16.26 × 18 =
17. 17.39 × 15 =
18. 18.43 × 12 =
19. 19.49 × 14 =
20. 20.37 × 24 =
21. 21.12 × 15 =
22. 22.30 × 24 =
23. 23.21 × 18 =
24. 24.45 × 24 =
25. 25.38 × 24 =
26. 26.19 × 14 =
27. 27.15 × 16 =
28. 28.18 × 24 =
29. 29.22 × 18 =
30. 30.21 × 16 =
31. 31.17 × 12 =
32. 32.48 × 18 =
33. 33.48 × 15 =
34. 34.34 × 15 =
35. 35.15 × 14 =
36. 36.26 × 14 =
37. 37.38 × 18 =
38. 38.47 × 24 =
39. 39.24 × 14 =
40. 40.11 × 16 =

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