180÷36
= 180÷(6×6)
= 180÷6÷6
=30÷6
=5。
Or:
180÷36
= 180÷( 18×2)
= 180÷ 18÷2
= 10÷2
=5
Extended data:
Simple calculation rule of multiplication:
1) multiplicative commutative law: a * b = b * a
2) Multiplicative associative law: a*b*c=(a*b)*c=a*(b*c)
3) Multiplicative distribution law: (a+b) * c = a * c+b * c; (a-b)*c=a*c-b*c
Simple calculation rule of division:
The quotient of 1) is invariant, that is, the dividend and divisor are multiplied or divided by a number (except zero), and the quotient is invariant.
a/b=(a*n)/(b*n)=(a/n)/(b/n)
2) The sum (difference) of two numbers is divided by a number, which can be used to divide the two numbers separately (in the case of divisible division), and then the sum (difference) of two quotients can be found.
(a+b)/c = a/c+b/c； (a-b)/c=a/c-b/c