Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 301 · 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. 1.16 × 16 =
2. 2.34 × 14 =
3. 3.31 × 14 =
4. 4.18 × 18 =
5. 5.20 × 14 =
6. 6.25 × 18 =
7. 7.21 × 12 =
8. 8.39 × 18 =
9. 9.30 × 18 =
10. 10.47 × 16 =
11. 11.48 × 12 =
12. 12.26 × 18 =
13. 13.38 × 14 =
14. 14.47 × 18 =
15. 15.35 × 15 =
16. 16.45 × 16 =
17. 17.18 × 14 =
18. 18.30 × 14 =
19. 19.22 × 15 =
20. 20.17 × 24 =
21. 21.41 × 14 =
22. 22.14 × 12 =
23. 23.38 × 18 =
24. 24.13 × 12 =
25. 25.20 × 24 =
26. 26.15 × 12 =
27. 27.33 × 16 =
28. 28.42 × 14 =
29. 29.36 × 24 =
30. 30.24 × 16 =
31. 31.38 × 12 =
32. 32.25 × 15 =
33. 33.17 × 12 =
34. 34.35 × 14 =
35. 35.43 × 12 =
36. 36.11 × 12 =
37. 37.22 × 24 =
38. 38.19 × 24 =
39. 39.24 × 14 =
40. 40.21 × 16 =

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