it was funny)

Question

the result is 3+5 =8. but I tried to write 35 ))) I was wonder why I couldn't put two digits!

Answer 1

If your problem is still actual, just make strings of numbers:
'3' + '5' == "35"

Answer 2

There was a place just for one digit. It was my mistake. I put 8 and it worked. Thanks for your advice.