Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 991 · 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. 1.18 × 12 =
2. 2.37 × 14 =
3. 3.30 × 16 =
4. 4.17 × 18 =
5. 5.29 × 16 =
6. 6.43 × 16 =
7. 7.39 × 15 =
8. 8.29 × 24 =
9. 9.22 × 16 =
10. 10.38 × 14 =
11. 11.19 × 14 =
12. 12.17 × 12 =
13. 13.31 × 15 =
14. 14.33 × 15 =
15. 15.41 × 12 =
16. 16.20 × 14 =
17. 17.25 × 18 =
18. 18.42 × 24 =
19. 19.13 × 16 =
20. 20.21 × 18 =
21. 21.21 × 12 =
22. 22.31 × 18 =
23. 23.27 × 16 =
24. 24.30 × 12 =
25. 25.48 × 18 =
26. 26.28 × 15 =
27. 27.33 × 16 =
28. 28.45 × 24 =
29. 29.42 × 15 =
30. 30.29 × 14 =
31. 31.18 × 18 =
32. 32.13 × 14 =
33. 33.24 × 15 =
34. 34.40 × 16 =
35. 35.39 × 24 =
36. 36.15 × 14 =
37. 37.38 × 16 =
38. 38.20 × 15 =
39. 39.14 × 24 =
40. 40.16 × 24 =

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