Dividing Decimals
Dividing with decimals is easy once you get rid of the decimal point in the number you are dividing by.
1. Fix the Outside Number. You want the number you are dividing by (the outside number) to be a whole number. To do this, hop the decimal point all the way to the right. 2. Match it on the Inside
Whatever you did to the outside number, you must do to the inside number. Move its decimal point the exact same number of hops to the right. Example: $12.6 div 0.3$. Change $0.3$ into a whole number by hopping the dot 1 time to the right. It becomes $3$. Do the same to $12.6$. Hop the dot 1 time to the right. It becomes $126$. Now your question is just $126 divided 3$, which equals $42$!
Compound shapes are really easy they have 2 different type of widths if you add them together you end up with an answer. To find the area of an compound shape you break it down into shapes you know. Then add each of them add both of them together then you find the missing side and use the measurements you already have to check and missing side length needed to find the area
LI: How To Subtract Decimals Using Algorithms.