Here is a list of science skills students learn in second grade! These skills are organized into categories, and you can move your mouse over any skill name to preview the skill. To start practicing, just click on any link. Smart Child Zone will track your score, and you will get immediate feedback as you practice!

### 1. Decimals

- Decimal numbers review
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- Compare and order decimals
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- Decimal number lines
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- Round decimals
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### 2. Number theory

- Prime or composite
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- Prime factorization
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- Multiplicative inverses
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- Divisibility rules
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- Greatest common factor
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- Least common multiple
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- GCF and LCM: word problems
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- Scientific notation
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- Compare numbers written in scientific notation
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- Classify numbers
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### 3. Integers

- Understanding integers
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- Integers on number lines
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- Absolute value and opposite integers
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- New! Quantities that combine to zero: word problems
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- Compare and order integers
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- Integer inequalities with absolute values
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### 4. Operations with integers

- Integer addition rules
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- Add integers using counters
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- Add integers
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- Integer subtraction rules
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- Subtract integers using counters
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- Subtract integers
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- Integer addition and subtraction rules
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- Add and subtract integers using counters
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- Add and subtract integers
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- Complete addition and subtraction equations with integers
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- Add and subtract integers: word problems
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- Integer multiplication rules
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- Multiply integers
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- Integer division rules
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- Divide integers
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- Integer multiplication and division rules
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- Multiply and divide integers
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- Complete multiplication and division equations with integers
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- Add, subtract, multiply, and divide integers
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- Evaluate numerical expressions involving integers
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### 5. Rational numbers

- Convert fractions or mixed numbers to decimals
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- Convert decimals to fractions or mixed numbers
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### 6. Operations with decimals

- Add and subtract decimals
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- Add and subtract decimals: word problems
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- Multiply decimals
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- Multiply decimals and whole numbers: word problems
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- Divide decimals
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- Divide decimals by whole numbers: word problems
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- Estimate sums, differences, and products of decimals
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- Add, subtract, multiply, and divide decimals: word problems
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- Multi-step inequalities with decima
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- Maps with decimal distances
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- Evaluate numerical expressions involving decimals
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### 7. Fractions and mixed numbers

- Understanding fractions: word problems
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- Equivalent fractions
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- Write fractions in lowest terms
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- Fractions: word problems with graphs and tables
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- Least common denominator
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- Compare and order fractions
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- Compare fractions: word problems
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- Convert between mixed numbers and improper fractions
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- Compare mixed numbers and improper fractions
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- Round mixed numbers
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### 8. Operations with fractions

- Add and subtract fractions
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- Add and subtract fractions: word problems
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- Add and subtract mixed numbers
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- Add and subtract mixed numbers: word problems
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- Inequalities with addition and subtraction of fractions and mixed numbers
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- Estimate sums and differences of mixed numbers
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- Multiply fractions and whole numbers
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- Multiply two fractions using models
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- Multiply fractions
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- Multiply mixed numbers
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- Multiply fractions and mixed numbers: word problems
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- Divide fractions
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- Divide mixed numbers
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- Divide fractions and mixed numbers: word problems
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- Estimate products and quotients of fractions and mixed numbers
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- Add, subtract, multiply, and divide fractions and mixed numbers: word problems
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- Maps with fractional distances
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- Evaluate numerical expressions involving fractions
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### 9. Exponents and square roots

- Understanding exponents
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- Evaluate exponents
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- Solve equations with variable exponents
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### 10. Linear functions

- Find the slope from a graph
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- Find the slope from two points
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- Find a missing coordinate using slope
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- Find the slope from an equation
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- Write a linear function
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- Identify linear and nonlinear functions
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