Summation of series

There are 32 NRICH Mathematical resources connected to Summation of series
Proof Sorter - Geometric Sequence
interactivity

Proof Sorter - Geometric Sequence

Can you correctly order the steps in the proof of the formula for the sum of the first n terms in a geometric sequence?
Pocket money
problem

Pocket money

Age
11 to 14
Challenge level
filled star empty star empty star
Which of these pocket money systems would you rather have?