Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 234 · 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. 1.16 × 18 =
2. 2.22 × 14 =
3. 3.20 × 24 =
4. 4.44 × 24 =
5. 5.13 × 15 =
6. 6.38 × 14 =
7. 7.12 × 16 =
8. 8.44 × 16 =
9. 9.19 × 24 =
10. 10.20 × 18 =
11. 11.17 × 24 =
12. 12.12 × 24 =
13. 13.24 × 14 =
14. 14.29 × 18 =
15. 15.27 × 14 =
16. 16.46 × 15 =
17. 17.48 × 14 =
18. 18.21 × 18 =
19. 19.41 × 16 =
20. 20.46 × 14 =
21. 21.44 × 18 =
22. 22.38 × 12 =
23. 23.39 × 16 =
24. 24.20 × 16 =
25. 25.35 × 15 =
26. 26.15 × 15 =
27. 27.20 × 14 =
28. 28.35 × 14 =
29. 29.26 × 16 =
30. 30.24 × 15 =
31. 31.21 × 15 =
32. 32.14 × 14 =
33. 33.41 × 15 =
34. 34.21 × 14 =
35. 35.16 × 15 =
36. 36.46 × 12 =
37. 37.16 × 14 =
38. 38.15 × 24 =
39. 39.34 × 18 =
40. 40.41 × 12 =

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