How to do adding mixed fraction with a whole

1/3 + 2/9
You have to make sure that the 2 numbers being added have the same denominators.

Multiply both the numerator and denominator by 3.

3/9 + 2/9

Add the numerators. 

5/9

Make the mixed number (mixed fraction) into a whole fraction. 
1. Multiply the whole number with the denomonater of the mixed number 
1 1/3 Multiply 1 and 3 to get 4. 
2. Add 4 with numerator. 
4+ 1 is 5. Put 5 above 3 (you keep the denomonator) and add it with the whole number. 5/3 + x (your numberetc)

2160ft^3 i think you could use a formala to you out with this in the future