Correct my math? ((5th grade math please don't say answers))?

Martin bought 8 baseball cards for 15 cents ea. If he paid $2 how much did he get back in change? - 80 cents



Daphne bought a 21- inch-long string of licorice at the canystore. She cut it into 4 equal lenghts to share with her friends. How long is ea. length of licorice? - 7 inches



Sarah used 3

-

5 of a sheet of stamps to mail cards. If there are 100 stamps in a whole sheet then how many stamps did Sarah use?

What percent of the stamps did Sarah use? - None



Round 1776 to the nearest hundred. - 1800



In which does the 5 have a value of 500,000? - 186,542,039



What is the pimeter of this rectange 12+12+8+8 mm - 40mm



640 divided by 30 - 21 R. 10



992 divided by 40 - 23 .2



800 divded by 50 - 16



7200 minus 1400 - 5800



1.25 x 80 - 100.000



700 divided by 10 - 70



679 x 489 - 2875531



8104 minus 5647 - 2467



2.86 + 6.35 + 1.78 + 0.46+ 0.62 - 12.09



4228 divded by 7 - 604



4635 divded by 9 - 55

Correct my math? ((5th grade math please don't say answers))?
ok,21 divided by 4 is not 7, 100 divided by 5 times 3,ok, ok,ok,ok,ok,ok,ok,ok,ok,ok,ok,12.07,ok, 515
Reply:holy crap, your smart...

I like shoes = )
Reply:I AM IN 5TH GRADE ACC

but this is too much

its hurting my brain