Why do this problem?
gives learners practice in fractions (tenths) as well as in addition and subtraction in a challenging form.
has two copies of the cake with all the possible places to cut marked.
What is the total of all the numbers on the cake? What is that divided by $3$?
How many numbers are there altogether on the cake?
If we cut the cake so that there is just one number on each piece, what fraction of the whole cake would each piece be?
Learners could change either the number of slices or the number of divisions and compare the results.
Suggest using a calculator to work out what is the total of the numbers on the cake, and on each slice.