It is my strong opinion that flash cards should be used, may be especially when the teacher (probably one of the children) is unexperienced.

You write the question on one side and the answer on the other.
Or more precise you write on one paper, fold and glue together.
I used the white paint for carpentry work and deluted it with 50 %water.

Flash cards should probably be used together with “Children’s Blackboard”

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