What is 45/4 + 6/9?
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Let's add
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Step 1We can't add two fractions with different denominators (the bottom number). So you need to get a common denominator - both bottom numbers need to match. To do this, you'll multiply the denominators times each other... but the numerators have to change, too. They get multiplied by the other term's denominator. So we multiply 45 by 9, and get 405, then we multiply 4 by 9 and get 36. Do the same for the second term. We multiply 6 by 4, and get 24, then multiply 4 by 9 and get 36. So now our fractions look like this:
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Step 2Since our denominators match, we can add the numerators. 405 + 24 = 429 So the answer is:
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Step 3Last of all, we need to simplify the fraction, if possible. Can it be reduced to a simpler fraction? To find out, we try dividing it by 2... Nope. Try the next prime number, 3... Are both the numerator and the denominator evenly divisible by 3? Yes! So we reduce it:
Now, try the same number again. Nope. Try the next prime number, 5... Nope. Try the next prime number, 7... Nope. Try the next prime number, 11... Nope. Try the next prime number, 13... No good. 13 is larger than 12. So we're done reducing. Congratulations! Here's your final answer to 45/4 + 6/9
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