Aarnout Brombacher co-authored Students’ Early Grade Understanding of the Equal Sign and Non-standard Equations in Jordan and India, as part of his international work in mathematics, by describing how we deal with equivalence in the NumberSense Workbooks.
![](https://www.numbersense.co.za/wp-content/uploads/2018/07/15_NumberSense-Workbooks_Contributing-to-Research_Image_012_10-Jul-2018.jpg)
![](https://www.numbersense.co.za/wp-content/uploads/2018/07/15_Research2_100718.png)