Question

A student said we cannot subtract 1,97 from 20 because 1.97 has two decimal digits and 20 has none. Do u agree with him?

Answer 1

I do not agree with him.

Explanation:

even though 20 has no visible decimal digits it has an infinite amount of zeros in the decimal digits. since 1.97 has two digits, then we can just write 20 as 20.00

20.00

- 1.97

_____

18.03

proof:

18.03

+1. 97

______

20.00