Well, i hate to put silly questions on the forums, but i had to do it this time ! Today i was arguing with my Math teacher on wether it is right or wrong to put equality between two different units. For example, to say that : 1 Metre = 3.4 Foot (i am not sure of the number ... anyway !). I personally see this is right, althought the two numbers are not the same, different units allow us to write equality between them, and from that we can derive that : 1=(3.4 Foot)/(1 Metre) Which makes lot of sense when thinking why we multiply by 3.4 when converting metres to feet. Since we are actually only multiplying by 1 (take the units in account), then it is right. But my teacher sees that putting the equality sign is wrong. What do u think ?