Maths

In maths I have been learning how to be rounding numbers I will give u 3 e.g 

So if I have 67.674 and I am doing the tenths the 67 stay the some and if it is above 5 u put at up 1 but if at is under 5 u leave that number alone so it would be 67.7 

So if I have 72.623 and I am rounding the whole number so it would be 72 

So if I have 23.4678 and I am rounding to the thousands so it would be 23.468