Tia and Tom algebra.

Today Room 10 solved a level 4 algebra problem to calculate how much money would be spent and how much was earnt by two twins. On sunday Tom one of the twins started of with $20.00 and spent $2.00 each day. Tia the  other twin started of with $0.00 and earned $2.50 each day. The strategy I used to help me calculate this problem was a small and simple one I simply counted in twos and by looking at this chart you can see what day Tia overlapped her twin brother friday . We used a line chart to show our thinking at the end Tia had $12.50 and Tom had $12.