Speed × time = distance/speed = time/distance/time = speed.
Number of copies × number of copies = total number of copies ÷ = total number of copies ÷ = number of copies.
1 multiple× multiple = multiple multiple1multiple = multiple multiple/multiple = 1 multiple
Work efficiency × working hours = total workload ÷ work efficiency = working hours ÷ total workload ÷ working hours = work efficiency.
Appendix+Appendix = and-one addend = another addend.
Minus-Minus = Difference Minus-Difference = Minus+Minus = Minus
Factor × factor = product ÷ One factor = another factor.
Dividend/Divider = quotient dividend/quotient = divisor quotient × divisor = dividend
There should be so many primary schools. .