Grade 4 Fractions: Adding Same Denominator

Worked examples

Real problems from the practice worksheets, solved one step at a time.

1. Example 1

   1/4 + 2/4 = ?

   1. The denominators are the same (4), so the pieces are the same size.
   2. Add the numerators and keep the denominator: 1 + 2 = 3, so the sum is 3/4.
   3. So 1/4 + 2/4 = 3/4.

   Answer: 3/4

2. Example 2

   Ava used 1/10 of a cup of flour for pancakes and 3/10 of a cup of flour for muffins. How much flour did Ava use altogether?

   1. Write the story as a number sentence: 1/10 + 3/10.
   2. The denominators are the same (10), so the pieces are the same size.
   3. Add the numerators and keep the denominator: 1 + 3 = 4, so the sum is 4/10.
   4. So 1/10 + 3/10 = 4/10.

   Answer: 4/10

3. Example 3

   A ribbon was cut into two pieces. One piece is 4/10 of a meter long and the other is 8/10 of a meter long. How long was the ribbon?

   1. Write the story as a number sentence: 4/10 + 8/10.
   2. The denominators are the same (10), so the pieces are the same size.
   3. Add the numerators and keep the denominator: 4 + 8 = 12, so the sum is 12/10.
   4. So 4/10 + 8/10 = 12/10.

   Answer: 12/10