---
labels:
  products:
    - oss
title: 'Math example'
---

- `$A` returns series `{host="web01"} 30` and `{host="web02"} 20`.
- `$B` returns series `{host="web01"} 10` and `{host="web02"} 0`.
- `$A + $B` returns `{host="web01"} 40` and `{host="web02"} 20`.