Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 754 · 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. 1.23 × 18 =
2. 2.15 × 16 =
3. 3.26 × 16 =
4. 4.20 × 15 =
5. 5.30 × 16 =
6. 6.12 × 12 =
7. 7.22 × 24 =
8. 8.32 × 15 =
9. 9.26 × 15 =
10. 10.22 × 14 =
11. 11.32 × 16 =
12. 12.37 × 18 =
13. 13.39 × 12 =
14. 14.49 × 14 =
15. 15.36 × 12 =
16. 16.21 × 24 =
17. 17.34 × 12 =
18. 18.46 × 18 =
19. 19.34 × 15 =
20. 20.47 × 16 =
21. 21.18 × 16 =
22. 22.41 × 14 =
23. 23.23 × 24 =
24. 24.47 × 14 =
25. 25.21 × 12 =
26. 26.19 × 16 =
27. 27.13 × 12 =
28. 28.18 × 24 =
29. 29.46 × 12 =
30. 30.40 × 15 =
31. 31.34 × 14 =
32. 32.15 × 15 =
33. 33.48 × 15 =
34. 34.44 × 14 =
35. 35.20 × 16 =
36. 36.36 × 18 =
37. 37.31 × 12 =
38. 38.42 × 12 =
39. 39.49 × 16 =
40. 40.32 × 18 =

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