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Add. Simplify your answer and write it as a proper fraction or as a whole or mixed number.

1
3
 + 
1
9
 = 
 
Fourth-grade skills Show expanded view
Number sense
Addition
Subtraction
Multiplication
Division
Mixed operations
Algebra
Functions
Coordinate graphs
Data, charts, and graphs
Logical reasoning
Patterns
Money
Measurement
Time
Geometry
Fractions and mixed numbers
Add and subtract fractions
Decimals
Add and subtract decimals
Probability and statistics