I've searched for years to find a math curriculum here in the UK that would help me teach math in a logical structured way. Most resources are designed for schools who follow rigid time scales and seem to be haphazard in their structure with one subject taught one day and another the next without building on knowledge. Math Mammoth has so far proved to be the exact opposite, starting with a foundation of knowledge then building on it. My 10 year old struggled with times tables but in a few weeks completing the light blue multiplication books now knows them by heart. My youngest has also taken to math in a big way since we started using this and has moved up early to 2nd grade. I love that an international version is available so currency and measurement are in pound sterling and metric.