Arithmetic Thinking
Learn to wield important tools in number sense and computation.
Level 1
Visualize Fractions
Combining Parts
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Splitting Parts
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Splitting and Combining
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Equal Parts
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Level Review
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Level 2
Equivalent Fractions
Sixths and Twelfths
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Eighths and Sixteenths
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Making Equivalent Fractions
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Simplifying Fractions
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Equivalent Fractions
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Identifying Equivalents
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Level Review
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Level 3
Comparing Fractions
Comparing Numerators
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Comparing Denominators
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Comparing Equivalents
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Comparing More Equivalents
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Identifying the Greatest
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Level Review
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Level 4
Adding Fractions
Adding Fractions
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Adding Same-Sized Fractions
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Adding Unlike Parts
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Adding Unit Fractions
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Adding Any Fractions
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Level Review
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Level 5
Multiplying Fractions
Multiples of Fractions
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Expressing Multiples
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Fractions of Unit Fractions
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Products of Unit Fractions
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Fraction of Any Fraction
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Multiplying Fractions
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Level Review
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Level 6
Percentages and Fractions
Intro to Percentages
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Working out Percentages
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Percentages and Batteries
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Percentages as Fractions
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Level Review
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Level 7
Percent Increase
Percent Increase
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Price Increase
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Calculating Percent Increase
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Level Review
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Level 8
Tenths, Hundredths and Decimals
Percentages as Tenths
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Percentages as Hundredths
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Finding the Percentage
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Percentages as Decimals
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Calculating the Percentage
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Level Review
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Level 9
Percent Decrease
Percent Decrease
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Calculating Percent Decrease
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Finding the Original Price
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Reversing Percentages
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Level Review
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Level 10
Compound Changes
Compound Changes
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Compound Calculations
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Splitting Percent Changes
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Growing and Shrinking
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Exponential Growth
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Level Review
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Level 11
Introducing Negatives
Positives and Negatives
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Negative Numbers
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Making Integers
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Addition
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Level Review
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Level 12
Addition, Opposites, and Zero
Increasing Value
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Decreasing Value
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Zero
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Opposites
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Adding Negatives
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Adding Negatives and Positives
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Level Review
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Level 13
Subtracting Integers
Missing Values
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Subtracting Positives
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Subtracting Negatives
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Subtracting From Zero
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Subtracting Positives 2
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Subtracting Negatives 2
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Level Review
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Level 14
Subtraction and Addition
Adding The Opposite
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Subtracting Using Addition
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Subtracting the Opposite
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Order in Subtraction
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Adding in Any Order
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Level Review
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Level 15
The Number Line
The Number Line
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Addition on the Number Line
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Adding Large Integers
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Adding Several Integers
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Subtraction from 0
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Subtraction on the Number Line
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Level Review
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Level 16
Order and Absolute Value
Ordering Integers
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Ordering Negatives
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Absolute Value
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Adding and Absolute Value
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Absolute Value Inequalities
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Reasoning with Absolute Value
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Level Review
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Level 17
Distance
Distance Between Integers
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A Pair at Every Distance
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Subtracting to Find Distance
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Absolute Value and Distance
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Reasoning About Distance
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Level Review
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