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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### 2. Number theory

- Divisibility rules
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- Prime or composite
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- Prime factorization
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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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- Classify numbers
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### 3. Integers

- Integers on number lines
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- Absolute value and opposite integers
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- Compare and order integers
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### 4. Operations with integers

- 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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- Add and subtract three or more integers
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- Add and subtract integers: word problems
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- Multiply and divide integers
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- Evaluate numerical expressions involving integers
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- Integer multiplication and division rules
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### 5. Rational numbers

- Least common denominator
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- Round decimals and mixed numbers
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- Convert between decimals and fractions or mixed numbers
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- Identify rational and irrational numbers
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- Absolute value of rational numbers
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- Compare rational numbers
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### 6. Units of measurement

- Convert rates and measurements: customary units
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- Convert rates and measurements: metric units
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- Precision
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- Convert between customary and metric systems
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### 7. Problem solving

- Multi-step word problems
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- Elapsed time word problems
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- Use Venn diagrams to solve problems
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### 8. Number sequences

- Identify arithmetic and geometric sequences
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- Write variable expressions for arithmetic sequences
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### 9. Expressions and properties

- Evaluate one-variable expressions
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- Evaluate multi-variable expressions
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- Properties of addition and multiplication
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- Identify terms and coefficients
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- Add and subtract like terms
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- Factors of linear expressions
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- Add and subtract linear expressions
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### 10. One-variable equations

- Which x satisfies an equation?
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- Write an equation from words
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- Solve equations: word problems
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- Solve one-step equations
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- Solve two-step equations
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### 11. Monomials and polynomials

- Identify monomials
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- Add and subtract polynomials
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### 12. Systems of linear equations

- Is (x, y) a solution to the system of equations?
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- Find the number of solutions to a system of equations
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- Classify a system of equations
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