Note that you wrote 4.50 without any units. To be the same it would have to be - 4.50 hours or 4.5 hours.
If written as 4:50 it is 4 hours 50 minutes. To have 4 1/2 hours it would be 4 hours & 30 minutes, or 4:30 (because 30 minutes is half of 60 minutes [which is 1 hour])
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One half (1/2), plus a quarter (1/4), equals 3/4. Remember One half is the same as 2 quarters, so its the same as adding 2/4 + 1/4
Yes! Since 0.25 if equal to one fourth and 15 is one fourth of an hour 4.25 hours is the same as 4 hours an 15 minutes
It is the same as the square root of 4 so it is 2