# Sum & validation in multiple numerical input question

7 months 3 weeks ago #173247 by vzyldd
Hi, need a little guidance please.

I'm using a multiple numerical input question but needs to validate the totals of the different sub-questions individually.

I need to check that the answer in sub-question 1 equals the sum of sub-question 2 and 3. Check that sub-question 4 is not more than the answer in sub-question 1.

I tried the validation in the sub-question validation box but somewhere I'm missing the target. I've used the following:
sum(Q2_4)=<sum(Q2_1) but are not sure if I am on the right track.
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LimeSurvey Partners
7 months 3 weeks ago #173255 by tpartner
I would think the question validation equation would be something like:

`{Q2_1 == sum(Q2_2, Q2_3) && Q2_4 <= Q2_1}`

Cheers,
Tony Partner
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The following user(s) said Thank You: vzyldd

7 months 3 weeks ago - 7 months 3 weeks ago #173257 by Joffm
Hi,
yes, you are.

sum(Q2_4)=<sum(Q2_1)

But why do you "sum"? This are single fields.

So it is something like:
(Q2_1==sum(Q2_2,Q2_3) AND (Q2_1>=Q2_4)

And the tip could be:
{if(Q2_1!=sum(Q2_2,Q2_3),"Sum not equal Total","")}
...

But you have to add something that allows empty fields. Otherwise you will see the red border if "Total" is filled, but "boys" and "girls" still empty. Of course the sum is not equal in this case.

Best regards
Joffm

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Last edit: 7 months 3 weeks ago by Joffm.
The following user(s) said Thank You: vzyldd