Levels are CK-12's student achievement levels.

Basic
Students matched to this level have a partial mastery of prerequisite knowledge and skills fundamental for proficient work.

At Grade (Proficient)
Students matched to this level have demonstrated competency over challenging subject matter, including subject matter knowledge, application of such knowledge to real-world situations, and analytical skills appropriate to subject matter.

Advanced
Students matched to this level are ready for material that requires superior performance and mastery.

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Spanish Books

- Addition of Integers
- Whole Number Addition
- Whole Number Subtraction
- Whole Number Multiplication
- Whole Number Exponents
- Values Written as Powers
- Evaluation and Comparison of Powers
- Whole Number Division
- Estimation and Rounding
- Estimation of Whole Number Addition and Subtraction
- Estimation of Whole Number Multiplication and Division
- Prime and Composite Numbers
- Factors, Multiples, Divisibility
- Factor Pairs
- Greatest Common Factor
- Greatest Common Factor Using Lists
- Greatest Common Factor Using Factor Trees
- Divisibility Rules to Find Factors
- Least Common Multiple
- Fraction Comparison with Lowest Common Denominators
- Fraction Ordering with Lowest Common Denominators
- Prime Factorization
- Common Multiples
- Expressions with Whole Numbers
- Expressions for the Product of a Number and a Sum
- Integers
- Integers that Represent Different Situations
- Opposites of Given Integers
- Integer Comparison on a Number Line
- Integer Addition
- Sums of Integers on a Number Line
- Sums of Integers with the Same Sign
- Sums of Integers with Different Signs
- Sums of Integers Using Absolute Value
- Integer Subtraction
- Differences of Integers Using a Number Line
- Differences of Integers with the Same Sign
- Differences of Integers with Different Signs
- Differences of Integers Using Absolute Value
- Integer Multiplication
- Integer Division
- Absolute Value of Integers
- Comparison of Integers with Absolute Value

- Decimals
- Decimal Addition
- Combinations of Decimal Money Amounts
- Decimal Subtraction
- Decimal Multiplication
- Multiplication of Decimals and Whole Numbers
- Estimation to Check Decimal Multiplication
- Area Models for Decimal Multiplication
- Decimal Division
- Division of Decimals by Whole Numbers
- Decimal Quotients Using Zero Placeholders
- Decimal Rounding and Division
- Division of Decimals by Decimals
- Division of Decimals by Decimals using Zero Placeholders
- Estimation to Check Decimal Division
- Decimal Estimating and Rounding
- Decimal Rounding on a Number Line
- Small Decimal Rounding to a Leading Digit
- Large Decimal Rounding to Decimal Representations
- Decimal Rounding to Estimate Sums and Differences
- Front-End Estimation
- Decimal Addition Using Front-End Estimation
- Decimal Subtraction Using Front-End Estimation
- Problem Solving Plan, Estimation with Decimals
- Scientific Notation Values
- Place Value
- Numbers with Decimal Place Value
- Numbers in Expanded Form
- Decimal Rounding Given Place Value
- Decimals in Words
- Decimal Comparison
- Decimal Comparisons without Rounding
- Decimal Comparisons with Rounding

- Properties of Rational Numbers
- Proper Fractions, Improper Fractions, Mixed Numbers
- Mixed Numbers as Improper Fractions
- Improper Fractions as Mixed Numbers
- Fraction and Mixed Number Comparison
- Decimals as Mixed Numbers
- Mixed Numbers as Decimals
- Operations with Mixed Numbers
- Sums of Mixed Numbers
- Differences of Mixed Numbers without Renaming
- Sums of Mixed Numbers with Renaming
- Expression Evaluation with Mixed Numbers
- Products of Mixed Numbers
- Expression Evaluation with Products of Mixed Numbers
- Quotients of Mixed Numbers
- Equivalent Fractions
- Fractions in Simplest Form
- Fractions
- Addition of Fractions
- Sums of Fractions with Like Denominators
- Sums of Fractions with Different Denominators
- Subtraction of Fractions
- Differences of Fractions with Like Denominators
- Differences of Fractions with Different Denominators
- Multiplication of Fractions
- Multiplication of Fractions by Whole Numbers
- Multiplication of Whole Numbers by Fractions
- Products of Two Fractions
- Products of Three Fractions
- Division of Fractions
- Division of Fractions by Whole Numbers
- Division of Whole Numbers by Fractions
- Quotients of Fractions
- Division of Mixed Numbers by Fractions
- Fraction Estimating and Rounding
- Fraction Rounding to the Nearest Half
- Mixed Number Rounding to the Nearest Whole
- Mixed Number and Fraction Estimation
- Product Estimation with Whole Numbers and Fractions
- Estimation of Sums of Mixed Numbers and Fractions
- Estimation with Mixed Number/Fraction Subtraction
- Product Estimation with Mixed Numbers/Fractions
- Quotient Estimation with Mixed Numbers/Fractions
- Expression Evaluation with Fractions
- Expression Evaluation with Different Denominators
- Expression Evaluation with Products of Fractions
- Problem Solving Plan, Diagrams

- Equations with Ratios and Proportions
- Ratios
- Equivalent Ratios
- Ratios in Simplest Form
- Comparison of Ratios in Decimal Form
- Identification and Writing of Equivalent Rates
- Comparison of Unit Rates
- Unit Rates
- Proportions
- Proportions Using Cross Products
- Proportions to Find Dimensions
- Proportions to Find Scale Ratios
- Problem Solving Plan, Proportions

- Percents
- Decimals as Percents
- Percents as Decimals
- Small and Large Percents as Decimals
- Fractions as Percents
- Percents as Fractions
- Conversion of Decimals, Fractions, and Percent
- Comparison of Fractions, Decimals, and Percents
- Percent Equations
- Simple Interest
- Simple Interest Equation to Find Interest Rate
- Percent Equation to Find Part a
- Percent Equation to find Percent
- Percent Equation to Find the Base b
- Proportions in Percent Equations
- Proportions to Find Percent, P
- Proportions to Find Part a
- Proportions to Find Base b
- Small and Large Percents
- Percent of Change
- Percent of Increase
- Percent of Decrease
- Percent of a Number
- Prices Involving Discounts
- Prices Involving Sales Tax
- Tip Estimation
- Total Bill Including Tip and Tax

- Properties of Numbers
- Properties in Decimal Operations
- Properties of Multiplication in Decimal Operations
- Commutative Property of Multiplication with Decimals
- Commutative Property of Addition with Decimals
- Properties in Fraction Operations
- Commutative Property of Addition with Fractions
- Commutative Property with Products of Fractions
- Problem Solving Plan, Choose an Operation

- Mental Math
- Mental Math to Evaluate Products
- Mental Math to Multiply by Whole Number Powers of Ten
- Mental Math to Multiply by Decimal Powers of Ten
- Mental Math to Add and Subtract Decimals
- Mental Math to Evaluate Quotients
- Mental Math to Divide by Whole Number Powers of Ten
- Mental Math to Divide by Decimal Powers of Ten
- Mental Math to Solve Proportions

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