Number Bonds within 20
Number Bonds within 20
Find the missing whole or part in each number bond within 20.
Number Bonds within 20
Your Number Bonds round
Ten questions with immediate feedback, alternating the missing whole or part.
Number Bonds within 20Question 1 / 10
Find the missing whole or part in the number bond.
Enter the missing number.
Round complete.
Correct first time: 0 / 10
This web round is not saved.
Read the complete relationship
The top circle is the whole. The two lower circles are its parts. Use all the visible values to find the one number that is missing.
Build confidence one bond at a time
The round begins with familiar bonds, moves through wholes above 10, and finishes with less obvious combinations near 20.
