Maths

Can you please tell me what TU means at the top of my sums eg., and do I put the sums answer in the circle between the sums and add the answer onto the next sums answer?

TU TU
23 15
16+ 0 17+
___ __

___ __

1. 👍 0
2. 👎 0
3. 👁 144

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