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Make square cards (about a little smaller than your palm) in the various colours you will teach. Each colour set will have numbers (some the same, some different) written in large font on them.
Scatter your pre-made colour number cards around the blackboard, making sure they are as evenly spaced as possible.
Divide the class into 2 teams. One at a time, the students will come up to represent their team. The ALT will call out a colour, then a number and the students must race to find the corresponding card. For each card they get, their team gets a point.
The team with the quickest hands wins. ?
You could play this game with 6 teams instead of 2, one per row, but it would leave much less room for the participating students in the front of class.