Reķini galvā!

Darbības rēķini galvā!
http://www.transum.org/software/SW/Starter_of_the_day/Students/Chain_Challenge.asp

Saliec pareizu darbību!
http://www.transum.com/Tables/Expedite.asp

Izklaidei - atrodi divus pārus, kas kopā veido 21!
http://www.transum.com/software/SW/Starter_of_the_day/Students/Pairs.asp?Topic=6