Race to 100

Pairs of students play Race to One Hundred and its opposite, Race to Zero, with base ten blocks. In the first game, each student, in turn, rolls a red die and a green die and makes a two digit number from the faces showing (using the red die as the tens digit). He or she then takes that many tens and ones from the bank. Whenever there are ten tens or ten ones in a player's collection, the player must trade for a larger block. The first player to collect one hundred is the winner. In Race to Zero, the players start with one hundred and give back blocks according to their dice rolls.