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Which is the related addition fact for 6 + 1 = 7?

1 + 4 = 5
1 + 7 = 8
1 + 6 = 7
1 + 5 = 6
First-grade skills Show expanded view
Counting and number patterns
Addition
Addition - skill builders
Subtraction
Subtraction - skill builders
Mixed operations
Comparing
Estimating
Fractions
Geometry
Spatial sense
Data and graphs
Measurement
Money
Patterns
Probability and statistics
Sorting, ordering, and classifying
Time