It is smaller because 4 isn't half of 9 but 1 is half of 2.
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9/40
No, 1/2 is smaller than 1. Think of it in the terms of a pie. A whole pie is bigger than 1/2 of a pie.
For starters 4.2 is bigger than 1 and 0.42 is smaller than 1. But they are both decimals which makes it harder to recognise which is bigger and which is smalled. 4.2 is bigger than 0.42!
0.25 is bigger than 1/5 which as a decimal is 0.2
1/4 = 0.25 That's bigger than 0.21 .