CTET Class I to V 23 Dec 2021 Paper

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Question : 55 of 150
 
Marks: +1, -0
Ms. Jenny, a class ll teacher asked her students ‘If you have 3 tens and you have to take away 3 units from it, which number do you get?”
One of her students responded ''It is zero''. To rectify the error, Ms jenny should first focus on: 
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