A mixed number.
The fraction sign means division, so divide 58 by 7.
You'd get about 8.285714 That is not a whole number. So multiply the eight times the original denominator, 7, to see what is left over in fractional form.
8 x 7 equals 56
58-56=2 Put 2 over the original denominator of 7 and keep the eight.
The mixed number is 8 2/7