Everyone knows how to find an average, but the power of this formula is often underestimated. We know: average = (sum of the items)/(number of items) Notice, we can also write this as: sum of items = (average)*(number of items) This latter form can be powerful. For example, if we add or subtract one item […]

# Archive | GMAT Math

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As you may remember from high school, , where b is the base and h is the height. If you are having trouble remembering this, simply remember that a rectangle has an area of , and that a triangle is half a rectangle. Practice Question: Using the Area Formula The figure on the left is […]

There’s a reason this is the most famous theorem in mathematics! This remarkable theorem is one of the most versatile and highly adaptable formulas in existence. Of course, I’m sure you remember that it says: For any right triangle, Of course, if any question […]