Which expression is equivalent to 3.6 x 0.1?

Explication

Multiplying by 0.1 is equivalent to dividing by 10, so both routes produce 0.36. Multiplying by 10 produces 36 and reverses the required direction of the decimal-point shift. Dividing by 0.1 would be the same as multiplying by 10 and gives 36, and multiplying by 0.01 moves the point two places left to 0.036 - only dividing by 10 matches multiplying by 0.1.