Number bonds to 10 are complementary part–part–whole relationships in which two whole-number parts from 0 through 10 combine to make 10, such as 6 and 4; reversing the parts does not change the total. These relationships may be represented with equations, part–part–whole diagrams, or a ten-frame, and support efficient addition and subtraction within 10. Bonds to larger numbers and generalized algebraic rules are outside this scope.
A number bond to shows two parts that join to make the whole, .
To find a missing part, start with the part you know and count up to .
Example:
Therefore:
The parts can switch places and still make :
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