Or if you want a more 'hands -on' activity, make finger puppets - cut the corners off junk mail envelopes & draw a face & a big number on each, put one on & get dd to find it's 'partner' You can start by drawing the pairs in the same colour e.g 4&6 red, 3& 7 green etc. Also they will stand up so she can sort them into pairs by herself.