Adding and subtracting fractions with like denominators word problems

The first instance of  is under the 4th Grade Math Mission. This exercise uses word problems to increase experience and competence with adding and subtracting fractions with common denominators.

Types of Problems
There is one type of problem in this exercise:


 * 1) Solve the problem: This problem has a situation described that involves adding or subtracting numbers. The student is asked to provide the correct answer to the problem in a box.WpfracCD.png

Strategies
This exercise is easy to get accuracy badges because the fractions have common denominators already. Speed badges are medium because it is often necessary to read the entire problem carefully to figure out if you want to add or subtract. I did see a red herring on one problem.


 * 1) The fractions do not need to be reduced.
 * 2) You will either add or subtract the two fractions in the problem, so look for the key words that will tell you if it is add or subtract.