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Wyzant
Wyzant: Fraction Simplifying Calculator
This WyzAnt applet allows the user to input fractions--improper or mixed numbers--and have the calculator reduce the fraction or convert it into a mixed number. A good resource for checking students work.
CK-12 Foundation
Ck 12: Arithmetic: Factor Pairs
[Free Registration/Login may be required to access all resource tools.] Determine the factor pairs of given numbers.