multiplication
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a way to analyze and solve problems using the units, or dimensions, of the measurements.
Your teacher can help you with fractions. Ask for extra worksheets and problems to solve. Your peers can also help you work problems.
Dimensional grouping is exactly what it sounds like, grouping numbers and problems in terms of how many dimensions they have. For instance there are two dimensional and three dimensional groupings.
You cannot solve proper fractions. You may be able to solve problems involving fractions but that is NOT the same thing. Furthermore, the solution methods depend on the problem.
There isn't a universal answer to all problems. What you should try to do is find the lowest common denominator between the fractions you are adding.