Adding fractions with unlike denominators

The topic  is under the 5th Grade Math Mission. This exercise starts practice on adding fractions where it is necessary to find common denominators.

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


 * 1) Add the fractions: This problem has an addition problem with two fractions that have unlike denominators. The student is asked to find the sum and write it in the appropriate spot.Addfracunlike.png

Strategies
This exercise is easy to get accuracy with basic fraction arithmetic properties. The speed badges are medium because the process for adding fractions is not extremely fast, but it can be done quickly with practice.
 * 1) Final answers do need to be simplified to get credit.
 * 2) A calclulator may go against the spirit of the problem but can increase speeds, especially if you know how to change decimals into fractions on a calculator.
 * 3) An algebraic rule to add the fractions a/b and c/d is to calculate $$ (ad+bc)/(bd) $$, but you will often need simplification if you add them in this way.