If the expression involves variables, you can plug in numbers to determine which expression is greater.
Plug in numbers
Sometimes the expressions have patterns that can help you determine their relationship.
Look for patterns
The constraints can limit the possible values of the expressions and help you determine their relationship.
Identify constraints
Don't forget to use logic when comparing the expression. if one expression is a fraction and the other is a whole number, the whole number is likely greater.
Use logic
The more you practice Quantitative Comparison questions, the better you will get at identifying patterns and simplifying expressions.
Practice
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