Question

Calculate the fractional average of the numbers
1/2, 5/8 and 7/16

Answer 1

add them then divide by 3

Answer 2

how you mean? Can you show me?

Answer 3

can you find the common denominator of these fractions?

Answer 4

no

Answer 5

the common denominator is 16.
if you knew 1/2 is the same as 8/16 (it is)
and you add 8/16 + 7/16 ?

Answer 6

15/16

Answer 7

now add 5/8 to that. First change 5/8 to 10/16
add to 15/16

Answer 8

25/16

Answer 9

now divide 25/16 by 3

\[ \frac{25}{16} \div 3 \]
the way to divide is "invert" the 3 and multiply. That means flip 3/1 to make it 1/3 and multiply:
\[ \frac{25}{16} \div 3= \frac{25}{16}\cdot\frac{1}{3} \]
multiply top times top and bottom times bottom