Adding and subtracting fractions

This task is about addition and subtraction of fractions.
illustration: Elsa running         illustration: Luka running
a)  
In a team race, Elsa ran \(1 \over 4\) of a kilometre and then tagged Luka who ran for \(1 \over 8\) of a kilometre.
 
Altogether, what fraction of a kilometre had they run? __________
 
 
 
 
illustration: pie
b)
Marie and Liam shared a pie. Marie ate \(1 \over 3\) of the pie and Liam ate \(1 \over 5\) of the pie.
What fraction of the pie ...
 
 
i)
 
ii)
did they eat altogether? __________
 
was left over? __________
 
 
 
illustration: cheese
c)
 
Wiremu had \(3 \over 7\) kilogram of cheese. He was given another \(2 \over 5\) kilogram.
 
What fraction of a kilogram of cheese did Wiremu now have? __________