Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 161 · 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. 1.22 × 12 =
2. 2.41 × 24 =
3. 3.23 × 24 =
4. 4.18 × 15 =
5. 5.11 × 12 =
6. 6.45 × 15 =
7. 7.46 × 15 =
8. 8.40 × 14 =
9. 9.12 × 16 =
10. 10.17 × 16 =
11. 11.26 × 14 =
12. 12.33 × 12 =
13. 13.14 × 18 =
14. 14.30 × 12 =
15. 15.49 × 14 =
16. 16.21 × 16 =
17. 17.31 × 18 =
18. 18.41 × 15 =
19. 19.37 × 12 =
20. 20.27 × 16 =
21. 21.11 × 18 =
22. 22.27 × 14 =
23. 23.14 × 12 =
24. 24.39 × 18 =
25. 25.16 × 12 =
26. 26.34 × 24 =
27. 27.27 × 15 =
28. 28.48 × 16 =
29. 29.12 × 14 =
30. 30.34 × 16 =
31. 31.42 × 16 =
32. 32.30 × 18 =
33. 33.47 × 12 =
34. 34.16 × 18 =
35. 35.29 × 15 =
36. 36.29 × 12 =
37. 37.31 × 16 =
38. 38.21 × 24 =
39. 39.19 × 24 =
40. 40.13 × 18 =

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