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At Trinity's swimming school, there are 3 students in beginning swimming, 7 students in intermediate swimming, and 9 students in advanced swimming. How many students are there in all at the swimming school?

students 
Second-grade skills Show expanded view
Counting and number patterns
Comparing and ordering
Names of numbers
Patterns
Addition - one digit
Subtraction - one digit
Addition - two digits
Subtraction - two digits
Addition - three digits
Subtraction - three digits
Properties
Mixed operations
Place values
Estimation and rounding
Logical reasoning
Money
Time
Data and graphs
Measurement
Geometry
Fractions
Probability and statistics
Multiplication
Division