# Error when multiply two number

hi,
i’m trying to do a simple multiplication formula, Qty * Unit Price , but it come out #error , anyone can help me to solve this problem , thanks!!

Hi Eric - welcome to the forum! Your formula won’t work because Airtable doesn’t view the “Unit price” field as a number. Since “N/A” is text (aka “string” type), it assumes that the whole field is a string. You can’t multiply a number times a string. Can you design your first formula to leave fields blank instead of “N/A”?

Hi Julian