CAHSEE Prep
 Released Test Questions
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Number Sense
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Statistics, Data Analysis
and Probability
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Algebra
and Functions
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Measurement and Geometry
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Mathematical Reasoning
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Algebra 1
PrenticeHall Algebra 1 California Edition

2.4
Subtraction of Rational Numbers
Problem 5
Online Scientific Calculator from Calculator.com
Graphing Calculator by CoolMath.com
Math Glossary
(more sophisticated than it looks!)