SKYMATHS

ag: okay QY, subtraction. can you remember what your teacher taught you?
sky: yes.
ag: read the instructions.
sky: *blah blah*
ag: do you know how to do the first one?
sky: no.
ag: okay. look here. how many snakes are there altogether?
sky: *counts* seven!
ag: now how many snakes are inside the box?
sky: three.
ag: so we take seven, and minus those in the box. seven minus how many?
sky: three!
ag: correct! good, you're thinking. so how many are left after you minus those in the box?
sky: maybe the snakes in the box were tired, so they wanted to go home first.
ag: maybe..