At the beach, pancho and his sister both built sandcastles and then measured their heights. pancho's sandcastle was 3/5 of a foot tall and his sister's was 2/5 of a foot tall. how much taller was pancho's sandcastle than his sister's?

1/5 of a foot

Simply subtract the height of Pancho’s sandcastle (3/5 of a foot) minus the height of his sister’s sandcastle (2/5 of a foot) to find a difference of 1/5 of a foot, meaning Pancho’s sandcastle was 1/5 of a foot taller than his sister’s sandcastle.