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Numbers up to 20
Addition

Number in the circle

(1) Fill in the missing number

6 4 3 5 8 1
0 1 4 2 6 0
1 2 3 0 7 3
3 2 5 4 7 4
0 0 2 3 10 6
6 7 3 5 5 4
6 3 5 1 8 5