They are in the same ratio
2:9 multiplied by 5 makes
2 x 5 = 10
9 x 5 = 45
so is 10:45
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10/45 = 2/9 10/45 can be reduced using 5. 10/5=2 45/5=9 Therefore 10/45 = 2/9
Make the lower numbers the same firstly 3/5 x 9/9 = 27/45 2/9 x 5/5 = 10/45 27/45 - 10/45 = 17/45
3/5 = 27/45 2/9 = 10/45 27/45 - 10/45 = 17/45
4.5 = 45/10 and 9/2 and reduces to: 4 1/2
Example 7/9 - 2/5 1. Make denominators the same (they're the bottom bits) 7/9*5/5 = 35/45 2/5*9/9 = 18/45 2. Now they're the same 35/45 - 18/45 = 17/45