1/45 = 1/45 as it cannot be reduced further.
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To subtract fractions, you need a common denominator. In this case, the common denominator is 45. So, 7/9 - 1/5 is equal to (35/45) - (9/45), which simplifies to 26/45.
1/2 2/4 3/6 4/8 5/10
1 hour and 45 minutes equal exactly 1 hour and 45 minutes. If you prefer fractions, it is 1 and 3/4 hours.
45 = 45/1
3/45 is equal to 1/15