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. Money

- Find the number of each type of coin
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- Add and subtract money amounts: word problems
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- Multiply money: word problems
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- Divide money amounts: word problems
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### 2. Number theory

- Prime or composite
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- Identify factors
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- Prime factorization
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- Prime factorization with exponents
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- Greatest common factor
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- Greatest common factor of three or four numbers
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- Least common multiple
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- Least common multiple of three or four numbers
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- GCF and LCM: word problems
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### 3. Problem solving and estimation

- Estimate to solve word problems
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- Multi-step word problems
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- Multi-step word problems: identify reasonable answers
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- Word problems with extra or missing information
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- Distance/direction to starting point
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- Use logical reasoning to find the order
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### 4. Units of measurement

- Estimate customary measurements
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- Estimate metric measurements
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- Convert and compare customary units
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- Convert and compare metric units
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### 5. Geometric measurement

- Area of triangles
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- Relate volume and surface area
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- Area of rectangles and squares
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- Area of parallelograms and trapezoids
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- Circles: word problems
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- Volume of cubes and rectangular prisms: word problems
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### 6. Statistics

- Identify statistical questions
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- Calculate mean, median, mode, and range
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- Mean, median, mode, and range: find the missing number
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- Changes in mean, median, mode, and range
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- Calculate quartiles and interquartile range
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- Calculate mean absolute deviation
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- New! Identify an outlier and describe the effect of removing it
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- Identify representative, random, and biased samples
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### 7. Probability

- Counting principle
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- Probability of one event
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- Make predictions
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- Compound events: find the number of outcomes by counting
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- Factorials
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- Permutations
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- Identify dependent and independent events
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### 8. Whole numbers

- Place values in whole numbers
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- Writing numbers in words: convert words to digits
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- Writing numbers in words: convert digits to words
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- Spell word names for numbers up to one million
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- Add and subtract whole numbers: word problems
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- Roman numerals
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