Grade 6

Percent up, percent down

Grow a number by 60% and it does not take 60% to bring it home -- the way back is a different rate. For a child learning to ask: a percent of what?

1
The way back
Increase a number $A$ by $60\%$ and the result is $B$ . By what percent must $B$ decrease to get back to $A$ ?
2
The way forward
Decrease a number $C$ by $37.5\%$ and the result is $D$ . By what percent must $D$ increase to get back to $C$ ?
3
Shorter sides, smaller square
If each side of a square is decreased by $20\%$ , by what percent does its area decrease?