Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 918 · 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. 1.26 × 18 =
2. 2.35 × 16 =
3. 3.38 × 24 =
4. 4.29 × 24 =
5. 5.33 × 16 =
6. 6.13 × 15 =
7. 7.18 × 12 =
8. 8.41 × 14 =
9. 9.24 × 24 =
10. 10.27 × 24 =
11. 11.14 × 24 =
12. 12.34 × 14 =
13. 13.32 × 24 =
14. 14.14 × 15 =
15. 15.25 × 14 =
16. 16.46 × 12 =
17. 17.39 × 16 =
18. 18.15 × 16 =
19. 19.20 × 24 =
20. 20.26 × 15 =
21. 21.36 × 14 =
22. 22.15 × 12 =
23. 23.16 × 14 =
24. 24.29 × 14 =
25. 25.23 × 18 =
26. 26.15 × 24 =
27. 27.48 × 18 =
28. 28.38 × 16 =
29. 29.42 × 18 =
30. 30.36 × 24 =
31. 31.11 × 12 =
32. 32.22 × 16 =
33. 33.22 × 15 =
34. 34.14 × 12 =
35. 35.21 × 16 =
36. 36.38 × 14 =
37. 37.27 × 12 =
38. 38.37 × 16 =
39. 39.43 × 18 =
40. 40.29 × 16 =

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