Math
posted by Angel on .
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)

Right.

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. 
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