C stands for centi, which means 100.

4/5 ÷ 8/25
First, To divide fractions is to find the reciprocal (reverse the numerator and denominator) of the second fraction and then multiply the two numerators. Then, multiply the two denominators.
= 4/5 x 25/8 = 5/2

Heptagon has 7 sides

Yes, as 28 can be written as 28/1 which is in the form of p/q

2/4 x 6 = 12/ 4
For simplest form, we have to divide numerator and denominator by the same number.
(12/4)/(4/4)= 3/1= 3

4m+3 = 4x5 +3 = 20+3 = 23
23 not equals to 24

6/7 = 0.857, since the digit after decimal is greater than 5, it will be rounded off to 1.

To find the decimal, we have to divide numerator by denominator.
¾ = 0.75

Prime factorization of 54- 2x3x3x3
Prime Factorization of 48- 2x2x2x2x3
By prime factorization , LCM (54,48 ) = 2x2x2x2x3x3x3 = 432

The Absolute values of a number is its distance from zero on a number line. So the absolute value of -23 and 23 are exactly same.
|-23| = 23

Product of two different signs is negative
+5 x (-4)= -20

To find the decimal number, first we have to divide the numerator by denominator i.e 7/8 = 0.875

Multiples of 12 = 12,24,36,48,60,72,84,96,108,120,132,144,156
Factors of 13 = 13,26,39,52,65,78,91,104,117,130,143,156
Least common multiple = 156

2 5/9  First convert mixed fraction into improper fraction.
2 5/9 = 9*2+5/9 = 23/9
Now we have to divide 23/9= 2.55

3 3/8 Convert the mixed fraction into improper fractions.
3 3/8= 8*3+3/8 = 27/8
First, To divide fractions is to find the reciprocal (reverse the numerator and denominator) of the second fraction and then  multiply the two numerators. Then, multiply the two denominators.
27/8 ÷4 = 27/8 x 1/4  = 27/32