Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 986 · 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. 1.18 × 24 =
2. 2.45 × 18 =
3. 3.22 × 24 =
4. 4.24 × 18 =
5. 5.45 × 14 =
6. 6.47 × 14 =
7. 7.40 × 15 =
8. 8.21 × 18 =
9. 9.22 × 12 =
10. 10.46 × 24 =
11. 11.14 × 18 =
12. 12.45 × 16 =
13. 13.38 × 12 =
14. 14.30 × 12 =
15. 15.37 × 14 =
16. 16.23 × 16 =
17. 17.47 × 24 =
18. 18.29 × 24 =
19. 19.20 × 24 =
20. 20.29 × 14 =
21. 21.41 × 14 =
22. 22.30 × 18 =
23. 23.27 × 12 =
24. 24.26 × 15 =
25. 25.22 × 18 =
26. 26.16 × 12 =
27. 27.21 × 16 =
28. 28.21 × 15 =
29. 29.38 × 16 =
30. 30.28 × 24 =
31. 31.18 × 18 =
32. 32.48 × 14 =
33. 33.47 × 12 =
34. 34.40 × 12 =
35. 35.24 × 14 =
36. 36.40 × 24 =
37. 37.40 × 18 =
38. 38.19 × 15 =
39. 39.46 × 12 =
40. 40.32 × 12 =

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