## Tutoring SAT Math Calculator Section

We focused on questions in the calculator section that she was having trouble with.

The first had a bag of marbles and was about finding probabilities. The basic idea is to find the number of specific option(s) you want and divide by the total number of options. There are variations on that.

For another problem, the vertex of a parabola was needed. You can use -b/2a to get the x-coordinate. That can also be derived using calculus by taking the derivative of ax^2 + bx + c and setting it equal to zero since the slope at the vertex is zero.

Sometimes using different forms of an equation, including what is originally listed, can be more useful for certain applications than a derived form.

Getting a common denominator is important for some problems.

The SAT often has answers that you would arrive at by making common mistakes.

Mean, median, and mode can show up. Most common would be mean (average).

sin^2x + cos^2x = 1, that showed up in practice.

## SAT Math, Adding 10% more efficiently

Alejandra seems to have a good foundation in math. With the SAT though, there are some topics which she has not seen in a few years which are less familiar. Also, the test often includes answers that you would arrive at if you make a common mistake.

For example, on the first problem we looked at, she went through the problem quickly but made a small mistake with overlooking a negative sign. That means she understands the process, however, she would have gotten the wrong answer there.

We went over the formula to get the sum of the interior angles of an n-gon, something like that could show up.

Also went over how adding 10% can be done more efficiently by multiplying by 1.1, etc. That was a useful technique for the test at times.