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. Subtraction

- Subtract numbers up to five digits: word problems
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- Subtract numbers up to seven digits: word problems
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- Estimate differences: word problems
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### 2. Number sense

- Convert between standard and expanded form
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- Value of a digit
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- Place value models
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- New! Relationship between place values
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- Convert between place values
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- Identify place value names
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- Writing numbers up to 1,000 in words: convert digits to words
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- Writing numbers up to 100,000 in words: convert digits to words
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- Writing numbers up to one million in words: convert digits to words
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### 3. Addition

- Add two numbers up to five digits: word problems
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- Add two numbers up to seven digits: word problems
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- Properties of addition
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- Estimate sums
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- Estimate sums: word problems
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### 4. Two-dimensional figures

- Open and closed shapes
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- Is it a polygon?
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- Number of sides in polygons
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- Lines, line segments, and rays
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- Parallel, perpendicular, and intersecting lines
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### 5. Multiplication

- Multiplication facts to 10
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- Multiplication facts up to 10: find the missing factor
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- Choose the multiples of a given number up to 10
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### 6. Variable expressions

- Write variable expressions
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- Write variable expressions: word problems
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- Evaluate variable expressions
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- Write variable equations to represent word problems
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### 7. Logical reasoning

- Find the order
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- Place value word problems
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### 8. Triangles and quadrilaterals

- Acute, obtuse, and right triangles
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- Scalene, isosceles, and equilateral triangles
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- Identify trapezoids
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- Identify parallelograms
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- Parallel sides in quadrilaterals
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- Classify triangles
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- Identify rhombuses
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- Identify rectangles
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- Classify quadrilaterals
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### 9. Symmetry

- Identify lines of symmetry
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- Count lines of symmetry
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- Rotational symmetry
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### 10. Probability and statistics

- Understanding probability
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- Find the probability
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- Make predictions
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- Find the mode
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- Find the mean
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- Find the median
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- Find the range
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