Good addition exercises but needs subtraction, multiplication and division. – Abacus' brain Review

I got this for my 7-year-old son but I enjoy working on it as well. Too bad the drill only comes with addition. I will like it a lot more and will highly recommend it if the update will add the mixed drills. One can grow out of the addition exercise fast.
Review by TS1001 on Abacus' brain.