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earnstyle [38]
4 years ago
15

2 over 5 plus 3 over 10

Mathematics
2 answers:
ser-zykov [4K]4 years ago
7 0
7/10

Because you have to have a least common denominator which is 10. and what you do to the bottom you have to do to the top you muct do to the bottom. So Therefore Multiply 5 by 2 to get 10 and do the same to the 2, the 2 will become 4. add the 4 and the 3 to get 7 over 10

Vilka [71]4 years ago
3 0
Step 1. Find the Least Common Denominator (LCD) of \frac{2}{5} , \frac{3}{10}

Method 1: By Listing Multiples
<span>List out all multiples of each denominator, and find the first common one.
</span>
Multiples of 5: 5, 10.....

Multiples of 10: 10,.....

Therefore, The (LCD) is 10.

Method 2: By Prime Factors.
List all prime factors of each denominator, and find the union<span> of these primes.
</span>
Prime factors of 5: 5

Prime factors of 10: 2, 5

Therefore, the LCD is 2*5=10

LCD = 10

Step 2. <span>Make the denominators the same as the LCD

</span>\frac{2*2}{5*2} + \frac{3}{10}
<span>
Step 3. </span><span>Simplify. Denominators are now the same

</span>\frac{4}{10} + \frac{3}{10}
<span>
Step 4. </span><span>Join the denominators

</span>\frac{4+3}{10}
<span>
Step 5. Simplify

</span>\frac{7}{10}
<span>
Done! :)

Decimal Form If Needed: 0.7</span>
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