We practice 90% of algebra and calculation skills with Numworx. We started in 2007 with mathematics for medium and advanced high school levels (HAVO/VWO beginners and VWO). Later we incorporated lower level HAVO classes and beginner TTO classes and occasionally also the older groups. Last year we introduced digital tests for 1st and 2nd years. All students can benefit from practicing algebra skills in DWO/Numworx. They can work at their own pace, surge ahead without a problem or redo last year’s module if they wish. And I can see at a glance who did what and I never have to read exercise books with illegible handwriting!