2:23
2x2+2x2=8
2(2+2x2÷2)
=2x4
=8
4x4+4x4=32
4(4+4x4÷4)
=4x8
=32
2x4+2×4=16
2(4+2x4÷2)=16
2x4+4x4=24
2(4+4x4÷2)=24