find each sum 1/7+ 3/21
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To find the sum of 1/7 and 3/21, we need to find a common denominator between the two fractions. In this case, the least common multiple (LCM) of 7 and 21 is 21.
Now, we need to express both fractions with a denominator of 21. To do this, we multiply the numerator and denominator of each fraction by the same value that will make the denominator equal to 21.
For the fraction 1/7:
1/7 * 3/3 = 3/21
For the fraction 3/21, the denominator is already 21.
Now, we can add the two fractions together:
3/21 + 3/21 = (3 + 3)/21 = 6/21
So, the sum of 1/7 + 3/21 is 6/21.