What is 21/63 + 10/11?
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Here's how to 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 21 by 11, and get 231, then we multiply 63 by 11 and get 693. Now for the second term. You multiply 10 by 63, and get 630, then multiply 63 by 11 and get 693. This gives us a new problem that looks like so:
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Step 2Since our denominators match, we can add the numerators. 231 + 630 = 861 That gives us an answer of
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Step 3Can this fraction be reduced? First, we attempt to divide it by 2... Nope! So now we try the next greatest prime number, 3... Are both the numerator and the denominator evenly divisible by 3? Yes! So we reduce it:
Let's try dividing by that again... Nope! So now we try the next greatest prime number, 5... Nope! So now we try the next greatest prime number, 7... Are both the numerator and the denominator evenly divisible by 7? Yes! So we reduce it:
Let's try dividing by that again... 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... Nope! So now we try the next greatest prime number, 19... Nope! So now we try the next greatest prime number, 23... Nope! So now we try the next greatest prime number, 29... Nope! So now we try the next greatest prime number, 31... Nope! So now we try the next greatest prime number, 37... No good. 37 is larger than 33. So we're done reducing. There you have it! Here's the final answer to 21/63 + 10/11
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