# Subtract two rates being monitored on the same webpage **URL:** \ **Category:** Help and Support\ **Tags:** conditions\ **Created:** [March 16, 2026, 1:49pm UTC](https://forums.distill.io/t/subtract-two-rates-being-monitored-on-the-same-webpage/5940 "2026-03-16T13:49:10Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![yashankdamani](https://forums.distill.io/letter_avatar_proxy/v4/letter/y/71c47a/32.png) [@yashankdamani](https://forums.distill.io/u/yashankdamani)\ **Post date:** [March 16, 2026, 1:49pm UTC](https://forums.distill.io/t/subtract-two-rates-being-monitored-on-the-same-webpage/5940/1 "2026-03-16T13:49:10Z")
There are two rates being monitored lets say A and B. The difference between the two is C. Generally A and B changes but C remains same. I want to be notified everytime the C changes ---
**Author:** ![srijith](https://forums.distill.io/letter_avatar_proxy/v4/letter/s/c77e96/32.png) [@srijith](https://forums.distill.io/u/srijith)\ **Post date:** [March 16, 2026, 8:51pm UTC](https://forums.distill.io/t/subtract-two-rates-being-monitored-on-the-same-webpage/5940/2 "2026-03-16T20:51:58Z")
@yashankdamani Just to confirm that I understood your requirement correctly. Are you trying to monitor a section where **A, B, and C are all shown on the page** , and although **A and B change frequently** , you only want to **receive an alert when the value of C changes** , even if A or B change? If that is the case, Distill currently does **not support setting a condition on a specific element’s value while ignoring changes in other elements within the same monitored area**. Since **A, B, and C are all numeric values and change independently** , the monitor would normally trigger whenever **any of the monitored text changes**. One possible approach could be Monitor **only the element that contains C** , instead of the whole section with A and B. To guide you properly, could you please share: - The **URL of the page** , or - A **screenshot showing A, B, and C on the page**