Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 974 · 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. 1.15 × 18 =
2. 2.28 × 15 =
3. 3.15 × 24 =
4. 4.13 × 15 =
5. 5.30 × 16 =
6. 6.47 × 14 =
7. 7.40 × 16 =
8. 8.33 × 14 =
9. 9.46 × 14 =
10. 10.21 × 12 =
11. 11.17 × 18 =
12. 12.22 × 16 =
13. 13.24 × 18 =
14. 14.49 × 14 =
15. 15.23 × 14 =
16. 16.13 × 16 =
17. 17.38 × 14 =
18. 18.18 × 12 =
19. 19.45 × 14 =
20. 20.30 × 24 =
21. 21.37 × 24 =
22. 22.32 × 18 =
23. 23.17 × 16 =
24. 24.26 × 12 =
25. 25.29 × 12 =
26. 26.11 × 18 =
27. 27.48 × 24 =
28. 28.16 × 24 =
29. 29.14 × 12 =
30. 30.41 × 16 =
31. 31.23 × 18 =
32. 32.21 × 15 =
33. 33.14 × 14 =
34. 34.20 × 15 =
35. 35.38 × 18 =
36. 36.44 × 24 =
37. 37.34 × 18 =
38. 38.46 × 24 =
39. 39.14 × 24 =
40. 40.45 × 18 =

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