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. Number theory

- Prime and composite numbers
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- Prime factorization
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- Prime factorization with exponents
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- Divisibility rules
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- Divisibility rules: word problems
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- Greatest common factor
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- Greatest common factor of three numbers
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- Least common multiple
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- Least common multiple of three or four numbers
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### 2. Fractions and mixed numbers

- Fractions review
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- Fractions of a whole: word problems
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- Fractions of a group: word problems
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- Equivalent fractions
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- Convert between improper fractions and mixed numbers
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- Least common denominator
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- Graph and compare fractions on number lines
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- Arithmetic sequences with fraction
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- Geometric sequences with fractions
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- Round mixed numbers
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- Reciprocals
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- Understand fractions as division: word problems
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### 3. Problem solving

- Write numerical expressions for word problems
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- Multi-step word problems
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- Find the order
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### 4. Multiplication

- Multiply by 1-digit numbers: word problems
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- Multiply numbers ending in zeroes: word problems
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- Properties of multiplication
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- Estimate products: word problems
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- Estimate products
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### 5. Division

- Division facts to 12: word problems
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- Divide multi-digit numbers by 1-digit numbers: word problems
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- Divide by 1-digit numbers: interpret remainders
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- Divide numbers ending in zeroes: word problems
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- Estimate quotients: word problems
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### 6. Addition and subtraction

- Add and subtract whole numbers: word problems
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- Properties of addition
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- Inequalities with addition and subtraction
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- Estimate sums and differences: word problems
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- Estimate sums and differences of whole numbers
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### 7. Add and subtract decimals

- Add and subtract decimals: word problems
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- Inequalities with decimal addition and subtraction
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- Estimate sums and differences of decimals using rounding
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- New! Estimate sums and differences of decimals using benchmarks
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### 8. Divide decimals

- Divide by powers of ten
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- Division with decimal quotients: word problems
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### 9. Ratios and rates

- Determine the ratio
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- Write a ratio: word problems
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- Identify equivalent ratios
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- Write an equivalent ratio
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- Scale drawings: word problems
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