- I bought the abacus for my Grandson who was having a problem with units tens hundreds etc. when I explained that it was the worlds oldest calculator he was hooked! After showing the units tens etc. concept he began to grasp what he had to do to make maths work for him. Unfortunately his younger sister who is 2 decided she wanted in on the fun and proved when the tug of war commenced that it also made a very efficient weapon and her brother discovered the better part of valour and waited with patience until she lost interest, before re - commencing his maths practise with so much less frustration than he had had with maths before.
Published on: 17 June 2014