Under Standing of mathematics- basics

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While Teaching  some boys did  not follow the concept - Defects noticed
When asked
The kids should understand the reasoning and logic to solve arithmetic problems
I asked the child the following question.
The cost of 1 mango is Rupees 5, what would be the cost of 10 mangoes = 5 Multiplied by 10 = Rs. 50
The cost of 10 mangoes is Rs. 50, what would be the cost of 1 mango = 50/ 10 = Rs. 5
If you give the shopkeeper Rs. 20, and purchased 3 mangoes that what is balance amount you would get back? 3 x 5 = 15, 20 – 15 = Rs. 5.
Cost of 1 mango is Rs. 5, and cost of one apple is Rs.15, what would be the cost of both Now add 5 + 15 = Rs. 20
This when explained a kid did not understand.
So the next step to make the child understand this was to
Show the mangoes, apple and Rupees. It was given a note book and a pencil. Now asked to calculate
This using Rs. 5 coins for each transaction.
On this experiment the kid under stood this concept.

Hence it he was asked to do 15 similar sums. Waiting for the result.
When the child was told that you had Rs. 100 and you spent 4/ 5 of it and you were left with 1/5 part, how much money are you left with. Again, the child did not understand this.
He had to be given Rs. 100 in hand (Rs. 5 coins) and asked to divide and then calculate the amount, it showed an improvement.
When give a sum, it again did not do it correctly.           

Deepak is a slow learner
Sanjay grasps a little fast.

Sums given:
1.       A worker can do a job in 6 days. He did 2/3 part of the job and left on leave.  For how many more days is he required to work in order to complete the job?  

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