Finding fractions

This task is about how to find fractional amounts of a total.
a)
A piece of timber was 36 cm long. 
If \(1 \over 4\) was cut off, what would the new length be?

Show your working.

 

 

Answer: __________cm

b)
James started with 32 marbles and lost \(3 \over 8\) of them. 
How many did he lose?  

Show your working.

 

 

Answer: __________

c)
Aroha won \(7 \over 9\) of the 72 tennis matches that she played. 
How many matches did she win?  

Show your working.

 

 

Answer: __________