I am an old man (80) learning calc, it was working fine but suddenly stopped calculating. See details

I am doing a personal budget, using currency figures (£). Columns B and C, C being totals for budget sections in B, entered fine. Then, fot my bottom line I entered a SUM calculation in column D and it would not take currency numerls, it hjust put ### into the cell. I have found that it now does this for further entries (tried experimentally) incolumns B & C, as well. What have I done wrong?

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This indicates the columns are too narrow to show the value.

All you need to do is increase the size of the columns and all should be well.

Hope you enjoy learning Calc.

Thank you very much. A satisfied old man, now.