# How to use CL to show if the math input submitted is correct?

**URL:** <https://cl.desmos.com/t/how-to-use-cl-to-show-if-the-math-input-submitted-is-correct/2321>\
**Category:** Questions\
**Tags:** validation, correctness\
**Created:** [January 6, 2021, 10:43pm UTC](https://cl.desmos.com/t/how-to-use-cl-to-show-if-the-math-input-submitted-is-correct/2321 "2021-01-06T22:43:28Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Jessica\_Mayer](https://yyz1.discourse-cdn.com/flex031/user_avatar/cl.desmos.com/jessica_mayer/32/1881_2.png) [@Jessica\_Mayer](https://cl.desmos.com/u/Jessica_Mayer)\
**Post date:** [January 6, 2021, 10:43pm UTC](https://cl.desmos.com/t/how-to-use-cl-to-show-if-the-math-input-submitted-is-correct/2321/1 "2021-01-06T22:43:29Z")

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I have the students writing quadratic equations from tables and then finding the y value for a specific value of x.

How can I make those “self checking”?

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**Author:** ![Daniel\_Grubbs](https://yyz1.discourse-cdn.com/flex031/user_avatar/cl.desmos.com/daniel_grubbs/32/719_2.png) [@Daniel\_Grubbs](https://cl.desmos.com/u/Daniel_Grubbs)\
**Post date:** [January 7, 2021, 12:13am UTC](https://cl.desmos.com/t/how-to-use-cl-to-show-if-the-math-input-submitted-is-correct/2321/2 "2021-01-07T00:13:42Z")

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Welcome. Can you share your activity? It’s helpful to at least to have an idea how you want it set up. Is the equation in the table? Or a math input?

Just as a preview, any cell in a table you want to have checked would need to be individually. If you expect decimal or fractional answers, there is a little more of a challenge, but not unmanageable.