Use any place value stategy to dive 3600 dive by 9 = also with work

Remember that (a/b) times (c/d) = (a times c) / (b times d)

also remember that

a times (b times c) = (a times b) times c

therefor

lets say you wanted to do

120/4

remember that 120=10 times 12 and 12/4=3 so

120/4=12/4 times 10/1=3 times 10=30

so you have

3600/9

remember that you try to get rid of the zeroes as much as possible

3600=36 times 100

3600/9=36/9 times 100/1

remember that 36/9=4 because 4 times 9=36 (mulitplication facts)

36/9=4

3600/9=36/9 ties 100/1=4 times 100=400

answer is 400