Equivalent fractions

The first instance of  is under the 4th Grade Math Mission. This exercise introduces different forms of the same fraction by manipulating denominators and numerators. It can also be viewed as an introduction to cross multiplication.

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


 * 1) Find the number: This problem provides a proportion, i.e., a statement that two ratios are equal. One of the numbers is missing and the student is asked to find the missing number.Equivfrac.png

Strategies
This exercise is easy to get accuracy and speed badges because there is only one type of problem, the numbers are manageable, and the techniques are well known


 * 1) It is fastest to quickly determine what the multiplier is from either the numerators or the denominators (whichever is given) and then just use that to complete the fraction. Cross multiplication techniques take longer than this since the number used are all integers, and usually small multipliers.