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Mercedes and Andy went around the neighborhood selling discount tickets to the school play. Mercedes sold 18 tickets. Andy sold 3 tickets. How many tickets did they sell in all?

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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