75 + 225 = 300.
In the one's column, 5 and 5 is 10, so carry a 1. In the ten's column, 7 and 2 and the carried 1 is 10, so carry another 1. In the hundred's column a 2 and the carried 1 is 3. Thus the answer is 300.
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The answer is 300. Simply add the numbers together arithmetically as you would for the problem two plus two. To check your work, a calculator is the best option.