I like your conscientious approach of not moving forward until he's confident in the first concepts. Mathematics is an area where if you miss some of the basics, you can't continue to build securely to understand later concepts, then it's small wonder that children will come to fear the subject. When teachers are schooling on mass, these things are easily missed, as they don't have the time to work with those who require a little more time.
@tipu curate
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