Write the same number in both boxes to make the sum correct.
What plus what equals 26? We have to put the same number in both of the empty boxes to make 26. What would happen if we were to half 26 or divide our 26 blocks into two equal groups? If we share the two tens, each group would have one ten each. And if we share the six ones, each group would have three each. Each group has one ten and three ones, which is 13. 13 plus 13 equals 26. The missing numbers are 13.