You ate 3 out of 8 slices, so the fraction is 3/8. The numerator (3) tells how many parts you have, and the denominator (8) tells how many equal parts make the whole.

In 5/12, the numerator is 5 (the number of parts you have), and the denominator is 12 (the total number of equal parts in the whole). Remember: "N"umerator = "N"umber of parts you have; "D"enominator = "D"own below tells the total parts.

9/4 is improper because 9 > 4. Its value is greater than 1 (2.25). Proper fractions like 3/4, 1/2, and 7/8 are all less than 1.

2/4 simplifies to 1/2 (divide numerator and denominator by 2). 4/8, 3/6, 5/10, and many others are also equivalent to 1/2. They all represent the same portion of a whole.

Find the greatest common factor (GCF) of 6 and 8, which is 2. Divide both numerator and denominator by 2: 6 ÷ 2 = 3, 8 ÷ 2 = 4, so 3/4. 3/4 is in simplest form because 3 and 4 share no common factors other than 1.

Since denominators are the same (9), compare numerators: 5 > 2, so 5/9 > 2/9. Think of a pizza cut into 9 slices: 5 slices is more than 2 slices.

Add numerators: 2 + 3 = 5. Keep denominator 7. So 2/7 + 3/7 = 5/7. The denominator stays the same because you are still talking about sevenths.

Divide 7 by 3: 3 goes into 7 two times (2 × 3 = 6), remainder 1. So 7/3 = 2 and 1/3, written as 2 1/3.

The marks represent: 0, 1/5, 2/5, 3/5, 4/5, 1. The 3rd mark from 0 (1st = 1/5, 2nd = 2/5, 3rd = 3/5) is 3/5.

Step 1: 24 ÷ 4 = 6 (one fourth of the class). Step 2: 6 × 3 = 18 (three fourths). So 18 students brought lunch.