Catching percentage errors with an estimate
Compare your percentage result with the starting amount. For example, 20% is one fifth of the whole. Check that your amount matches that relationship.
Try it yourself first.
Find 20% of 350. Check it by finding 10% first and by dividing by five.
View the solution or example answer
10% is 35, so 20% is 70. Also, 350 ÷ 5 = 70. A result of 700 would contradict the fact that 20% is smaller than the whole.
Your next step.
Include a checking method in every solution. Discuss the expected size as well as the steps. Recheck units and the decimal point if the result does not fit.
Joining online lessons from Sultangazi.
Lessons with Songül Nazariani are live, one to one and exclusively online. Share your needs for primary or middle school maths, general English, conversation practice, IELTS or TOEFL preparation. Suitable days, times, lesson duration and fees are discussed together.
Sharing the student’s year group and a question they find difficult helps us plan the starting point.