Posted by Angel on Friday, February 14, 2014 at 6:46pm.
Everyone in Andy’s class has to do a science project. Out of the 20 students, 80% have completed their project. How many students still need to finish their projects (got 4 students)

Math  Ms. Sue, Friday, February 14, 2014 at 6:50pm
Right.

Math  Someone is Watching you (Like a teacher), Monday, February 8, 2016 at 5:58pm
Ms. Sue is wrong. You are finding 80% of 20. Multiply 80 times 20, and get an answer of 1600.
Then, multiply 1600 by 100, and get an answer of 16. You are not simplifying.
Or, Multiply 8x2 and get 16, either way.

Math  KKB, Tuesday, February 9, 2016 at 12:12pm
No Ms. Sue is correct because you have to multiply 20 by .80 and get 16
But then you have to subtract 16 by the original number so
20  16 = 4
Answer is 4 students need to finish
HOPED this helps
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