I have made a few calculators. Here they are:
Pythagorean Theorem Calculator
http://scratch.mit.edu/projects/laptop97/1945023
Quadratic Equation Solver
http://scratch.mit.edu/projects/laptop97/1944692
y=mx+b Calculator
http://scratch.mit.edu/projects/laptop97/1943774
An Advanced Calculator
http://scratch.mit.edu/projects/laptop97/1889666
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