What is 78/10 + 2/3?
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This is how you add
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Step 1We still have different denominators (bottom numbers), though, so we need to get a common denominator. This will make the bottom numbers match. Multiply the denominators together first. Now, multiply each numerator by the other term's denominator. Now we multiply 78 by 3, and get 234, then we multiply 10 by 3 and get 30. Now for the second term. You multiply 2 by 10, and get 20, then multiply 10 by 3 and get 30. This gives us a new problem that looks like so:
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Step 2Since our denominators match, we can add the numerators. 234 + 20 = 254 So what's the answer so far?
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Step 3Can this fraction be reduced? First, we attempt to divide it by 2... Are both the numerator and the denominator evenly divisible by 2? Yes! So we reduce it:
Let's try dividing by that again... Nope! So now we try the next greatest prime number, 3... Nope! So now we try the next greatest prime number, 5... Nope! So now we try the next greatest prime number, 7... Nope! So now we try the next greatest prime number, 11... Nope! So now we try the next greatest prime number, 13... Nope! So now we try the next greatest prime number, 17... No good. 17 is larger than 15. So we're done reducing. There you have it! Here's the final answer to 78/10 + 2/3
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