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2.9 = 29/10. One is just written as a decimal.
Do you understand how to arrive at 29/10?
Consider the denominators in your original problem. How could we arrive at a common denominator?
what do u mean
When we have fractions with different denominators, we cannot add or subtract straightforwardly. We first have to convert each to a common denominator.
For example, if we had 1/3 + 1/4 we would convert both fractions such that each had a denominator of 12
1/3 = 4/12
1/4 = 3/12
1/3 + 1/4 = 4/12 + 3/12 = 7/12
Another way of asking the question is: what is a common multiple of 3 and 4? In this case, 12 is. So we convert each fraction so it has a denominator of 12, then add them.
The same reasoning is true for your problem. What is a common multiple of 2 and 5?