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In middle school, the evidence shows a slight correlation between doing homework and academic achievement , but further improvement fades after a middle-school student has spent 60 to 90 minutes a night doing homework, said Pope, who is also the co-founder of Challenge Success, an organization that works with schools and families to develop research-based strategies that engage kids and keep them healthy.

But it's tricky to draw conclusions from homework studies, because these studies use such varied ways of measuring a student's academic performance, Pope said. Some researchers use standardized test scores to measure achievement, while others use students' grade-point averages, she said. Another variable that can complicate the results of homework studies is that it's hard to know who is actually doing the assignment when it's taken home, Pope said. For example, a student could get help from a parent , tutor, sibling or classmate to complete the work.

In high school, there is a strong correlation between students who do 2 hours of homework a night and higher levels of academic achievement, but again, this improvement fades when students exceed the 2-hour threshold, Pope told Live Science.

Pope said she considers the advice that the viral note offered to parents —to eat dinner as a family, read together, play outside and get a child to bed early — to be "spot on. Studies suggest that to perform at their best in school, kids in second grade need sufficient sleep , playtime with their siblings and friends, and downtime, meaning time to transition from school to home.

Kids also benefit from regular family time, which ideally takes place five times a week for at least 25 minutes and could take the form of a family meal, Pope said. Making time for reading is also important for a child's success in the classroom, she said. The contention that "research is unable to prove that homework improves student performance" is an overstatement, said Harris Cooper, a professor of psychology and neuroscience at Duke University in Durham, North Carolina, who has been researching homework and student performance for 30 years.

Even when looking at levels as early as second grade, studies have found that kids who study a little bit at home may do better on spelling, vocabulary and math tests given in the classroom, Cooper told Live Science. However, he noted that the correlation between doing homework and higher academic achievement is not as strong in elementary students, who generally don't get much homework, as it is in middle-school and high-school students.

Rather than a no-homework policy for second graders, Cooper said he would recommend that homework for kids at this age be kept short and simple. It should take no more than about 20 minutes a night for second graders to complete their homework, he said. To estimate an appropriate amount of time for students to spend doing homework, educators may use "the minute rule" which means multiplying a child's grade level by 10 minutes of homework a night, Cooper explained.

That means first graders get 10 minutes of homework, second graders get 20 and so on. Besides just the skills in math, reading or other subjects themselves, homework can have positive effects on children's time-management and study skills, Cooper said.

It can also help keep parents informed of what children are learning at school, and help make Mom and Dad aware of their child's strengths and weaknesses, he said. But too much homework in second grade or assignments that are too hard can have a negative impact on young learners, Cooper said.

Some parents who are extremely concerned about ensuring that their children achieve to their maximal ability may put pressure on educators, and this has led some teachers to assign students too much homework, especially at the high-school level, Cooper said. But the key is for students to get the right amount of homework — not too much of it and not too little — so that it can have positive effects on learning and school performance, Cooper said.

But other educators are steadfast that the right amount of homework in elementary school may be little to none. Master in all the science branches with Tutorvista online science tutors. Biology is that branch of science which deals with anything living.

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