Terrific+Triangles

How Many?

Counting

[]

__ [] __ NUMBER TRAINS

[] resource%22&contenttype=%22Collection%22&contenttype=%22Image%22&contenttype=%22Moving image%22&contenttype=%22Sound%22&userlevel=all&userlevel=(0 OR 1 OR 2)&userlevel=(3 OR 4)&userlevel=(5 OR 6)&userlevel=(7 OR 8)&userlevel=(9 OR 10)&userlevel=(11 OR 12)&kc=any&lom=true&scot=true&follow=true&topiccounts=true&rows=20&fromSearch=true

Addition []

ShapesMatching [] []

Ordering Numbers []