Adding Fractions
Find the sum.
2/5 + 1/2
9/10
2/3 - 1/2
1/6
Christine baked a whole pumpkin pie. She ate 1/6 of the whole pie.
How much of the pie is left over?
5/6 of the pumpkin pie is left over.
1/5 + 1/5 + 2/5
4/5
2/3 - 2/5
4/15
Ms. Math has 3/4 of a pizza for dinner. She eats 2/3 of the pizza. What fraction of the pizza is left?
1/12 of the pizza is left.
1/7 + 1/2
9/14
5/7 - 2/3
1/21
Ashly and Maria are comparing their positive points. Ashly has 2/5 of the class' positive points, and Maria has 1/3 of the class' positive points. What fraction of the class' positive points do the girls have altogether?
Ashly and Maria have 11/15 of the class' positive points.
Find the sum. Write the sum as a mixed number.
3/4 + 2/3
17/12 = 1 5/12
1 1/2 - 5/6
8/12 or 2/3
Mr. Snowden has 1 dollar that he plans to share with some friends. He gives 1/4 of the dollar to Alison, 1/2 to Ariel, 1/8 to Mahlet, and he keeps what's left. What fraction of his money does Mr. Snowden have left?
Mr. Snowden has 1/8 of his money left.
Find the sum. Write the sum as a mixed number.
5/6 + 3/5
43/30 = 1 13/30
1 2/5 - 3/4
13/20
King Dorchak was asked to find the sum of 3/4 + 3/5.
He explained his thinking: "I see that the numerators are the same, so I can add 3 + 3 to equal 6. Then, I just added the denominators, 4 + 5, to equal 9. So, my sum is 6/9."
Mr. Dorchak is incorrect because you cannot add or subtract fractions unless the denominators are the same/equivalent.
He needed to convert 3/4 to 15/20 and 3/5 to 12/20. Then, he would add 15/20 + 12/20 to equal 27/20. Finally, we would write 27/20 as the mixed number: 1 7/20.