Description
Math game that drills addition & subtraction in intervals of 10; players match their stones to existing ones on the pyramid with a value of + or – 10; the object is to get rid of all your stones by building the pyramid; takes only 30 seconds to learn; builds fluency in basic addition & subtraction while emphasizing mental math skills; 1-4 players; grades 1+; originally retailed for $23.99 each.
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