When Numberblock One opens a fix-it shop, her friends bring broken things that need to be repaired. Using her special goggles, One works out how many missing parts they require from the boxes of bits and pieces in her workshop. How many parts does Two need to make one whole sledge? And what about Three's rocket? Once they have found everything, One uses her brand new magical workbench to put the pieces together to make the toys whole. 
 

The Numberblocks are on an adventure exploring Fraction Island. They are curious to learn why there are four islands when their map only shows one. When they meet a new friend, One Whole, they realise that they need to explore all the islands and find more Fraction Friends if they want to solve the mystery!