What is 78/10 + 2/8?
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Here's how to add
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Step 1Of course, you can't add two fractions if the denominators (bottom numbers) don't match. To get a common denominator, multiply the denominators together. Then we fix the numerators by multiplying each one by their other term's denominator. Now you multiply 78 by 8, and get 624, then we multiply 10 by 8 and get 80. Do the same for the second term. We multiply 2 by 10, and get 20, then multiply 10 by 8 and get 80. The problem now has new fractions to add:
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Step 2Since our denominators match, we can add the numerators. 624 + 20 = 644 This yields the answer
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Step 3The last step is to reduce the fraction if we can. To find out, we try dividing it by 2... Are both the numerator and the denominator evenly divisible by 2? Yes! So we reduce it:
So far so good... let's try to divide by that number again. Are both the numerator and the denominator evenly divisible by 2? Yes! So we reduce it:
So far so good... let's try to divide by that number again. No good. So next you try the next prime number, which is 3... No good. So next you try the next prime number, which is 5... No good. So next you try the next prime number, which is 7... No good. So next you try the next prime number, which is 11... No good. So next you try the next prime number, which is 13... No good. So next you try the next prime number, which is 17... No good. So next you try the next prime number, which is 19... No good. So next you try the next prime number, which is 23... No good. 23 is larger than 20. So we're done reducing. And we're done! Here's the final answer to 78/10 + 2/8
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