A student was given the following problem on percentage to solve,
“Find the percentage of decrease if the population of a city decreased from 28, 000 to 26, 500.”
She wrote the following solution, Original population = 28,000; New population = 26,500

Which of the following is most appropriate with respect to the response of the student?

​What is necessary to remove learning related mistakes and lacunae?​

Students in a class are solving questions based on percentage discounts. One question requires the students to calculate the cost of two bikes, with a 8% discount on each bike. One of the groups calculate the total cost of the bike and then deducts 16% from the total cost. The method used by this group is:

A student solved the given quadratic equation in the following way :

Which of the following represents the error committed by the student ?

A vegetable seller was selling spinach for ₹60 per kg. Sonu purchased 350g of spinach for which the vegetable seller took ₹21 (₹6+₹6+₹6+₹3) from Sonu. Which of the following statements is/are true regarding the mathematical skills used by the vegetable seller?
A. This mathematical skill is ambiguous.
B. This skill is not useful to solve mathematical problems in class.
C. Such skills help in developing alternate strategies for solving mathematical problems.
Choose the correct option: