( 180-80)÷5
= 100÷5
=20
Extended data:
Integer division:
1, divided by high dividend;
2. How many digits is the divisor? Look at the first few digits of the divisor first. If the divisor is not enough, look at another one.
3, in addition to which one, which one must be written on the business;
4. The remainder of each division must be less than the divisor;
5. After finding the highest bit of the quotient, if there is not enough quotient 1 on the dividend, write 0 on it.
Text expression:
Appendix+Appendix = sum, one addend = sum-another addend.
Minus-Minus = Difference, Minus = Minus-Difference, Minus = Difference+Minus.
Factor × factor = product, one factor = product ÷ another factor.
Dividend = quotient, divisor = dividend = quotient, dividend = quotient × divisor.