873 Math Blog

-When subtracting fractions you do the same thing wih the adding but after you find the common denominator you subtract.





-There are a few ways you can divide fractions. The first is by using a ratio table.
- I will also show you how to solve it using a reciprocal. It is the inverse of the denominator.

Adding Mixed Numbers.

This is my mini scribepost on adding mixed numbers.

These are the mixed numbers I will be adding.
1 3/4 + 1 1/8 =
2 4/5 + 1 1/2 =


1 3/4 + 1 1/8=1 12/16 + 1 2/16 = 2 7/8

I added the whole numbers first and which added up to 2. Then I made the denominator 16 instead of 32 because it would take longer. I knew 3 quarters of 16 was 12 and 1 eighth of 16 was 2. Then after, you just add the fractions and it would be 14. But since 14 and 16 were equal, i divided it by 2. So the fractions is 7 over 8. Made it into a simplified fraction.

2 4/5 + 1 1/2 = 4 3/10

I made the denominator 10 because 5x2=10. Then I made the numerator 8 because 5 fits into 10, 2 times. Then I made the other numerator 5 because 2 fits into 10, 5 times. I knew if you added 5+8 it would make an improper fraction. So I made another whole number. Then I added all the whole numbers up and it became 4 3/10.

Also we got word problems i will do 2 of them:

When Betty opens the cake box, Betty finds that 3/8 of the cake has been squished. Luckly she finds half a container of ice cream in the freezer. If she molds it properly she will have enough to make the cake whole again.

3/8 -cake

1/2 - ice cream

3/8 + 1/2 =

3/8 + 4/8=

= 7/8 !

next question

Betty is making punch for the party goers. She needs 3/5 L of orange juice, 1/2 L of lemonade and 1/4 L of Grenadine. How much liquid is in the punch?

3/5 -orange juice

1/2 - Lemonade

1/4 Grenadine

3/5 + 1/2+ 1/4 =

12/20 + 10/20+ 5/20=

= 27/20

change to mixed = 1 and 7/20

Thanks and please leave a comment. For the next scribe i choose Lina! For people who don't know who that is, it's Zerlina.

Today, Mr. Harbeck was talking about his kids that can do football and run on balance beams. Something like that. Anyway, one of them had a math problem and it was 1/2 + 1/3.

Then we talked about what we needed to add fractions.

What do you need to add fractions?

-common denominator

-same size parts

One way to find the common denominator is to multiply the denominator.

We had to solve 2 other questions using pictures.

Anyway, for homework, we had to solve the following questions using the math way and the picture way.

2/3 + 1/8

1/4 +3/5

1/6 + 3/4

3/8 +1/6

5/7 + 1/2

1 1/2 + 3/4

For the next scribe, I pick Shaneille.