Answers

2015-09-26T09:47:03+08:00

This Is a Certified Answer

×
Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
Change the mixed number into improper fraction, so that we can answer it easily.

To change a mixed number into a improper fraction, the formula is:
dw + n = new numerator

wherein
d = denominator
w = whole number
n = numerator

Performing the operation:
7 1/7 as a improper fraction is:
7 x 7 + 1 = 50/7
2 5/8 as a improper fraction is:
8 x 2 + 5 = 21/8

Now our fraction can be answered properly, and easily.
50/7 - 21/8 = ?

Find the LCD.
7 : 7, 14, 21, 28, 35, 42, 49, 56
8 : 8, 16, 24, 32, 40, 48, 56

So 56 is the LCD of 50/7 and 21/8

56 is going to be our denominator in our answer.
56 / 7 x 50 = 400
56 / 8 x 21 = 147

400 - 147 is 253
So the answer is 253/56
Re-writing as a mixed number:
4 29/56
is the answer
1 4 1