Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 416 · 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. 1.30 × 16 =
2. 2.19 × 15 =
3. 3.20 × 24 =
4. 4.22 × 24 =
5. 5.32 × 12 =
6. 6.13 × 15 =
7. 7.42 × 16 =
8. 8.39 × 18 =
9. 9.23 × 12 =
10. 10.45 × 16 =
11. 11.49 × 16 =
12. 12.22 × 18 =
13. 13.28 × 16 =
14. 14.18 × 14 =
15. 15.41 × 18 =
16. 16.41 × 15 =
17. 17.31 × 12 =
18. 18.44 × 14 =
19. 19.46 × 12 =
20. 20.34 × 15 =
21. 21.40 × 16 =
22. 22.22 × 14 =
23. 23.26 × 24 =
24. 24.44 × 12 =
25. 25.37 × 24 =
26. 26.43 × 16 =
27. 27.11 × 18 =
28. 28.19 × 24 =
29. 29.21 × 14 =
30. 30.18 × 18 =
31. 31.45 × 12 =
32. 32.12 × 24 =
33. 33.12 × 16 =
34. 34.14 × 24 =
35. 35.37 × 14 =
36. 36.43 × 12 =
37. 37.48 × 16 =
38. 38.26 × 16 =
39. 39.33 × 24 =
40. 40.32 × 16 =

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