Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 490 · 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. 1.20 × 12 =
2. 2.13 × 16 =
3. 3.13 × 12 =
4. 4.22 × 12 =
5. 5.49 × 14 =
6. 6.41 × 15 =
7. 7.29 × 12 =
8. 8.45 × 24 =
9. 9.20 × 18 =
10. 10.47 × 14 =
11. 11.34 × 12 =
12. 12.38 × 12 =
13. 13.32 × 12 =
14. 14.26 × 12 =
15. 15.49 × 15 =
16. 16.19 × 16 =
17. 17.33 × 24 =
18. 18.23 × 24 =
19. 19.22 × 18 =
20. 20.21 × 12 =
21. 21.13 × 18 =
22. 22.49 × 16 =
23. 23.29 × 16 =
24. 24.45 × 16 =
25. 25.40 × 12 =
26. 26.37 × 14 =
27. 27.26 × 14 =
28. 28.14 × 15 =
29. 29.38 × 15 =
30. 30.22 × 24 =
31. 31.20 × 15 =
32. 32.47 × 16 =
33. 33.35 × 12 =
34. 34.18 × 14 =
35. 35.40 × 18 =
36. 36.34 × 16 =
37. 37.12 × 15 =
38. 38.33 × 14 =
39. 39.27 × 15 =
40. 40.25 × 24 =

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