The easiest way to explain this concept was to stuck up the sticks in 10s and singles, so it's clear that when the singles are subtracted, all that are the extras to the 10s, only 10s are left.
It seems really confusing to describe in writing, as it was to explain in words, so perhaps the pic will make more sense. I practice it worked really well.
Now we just need to go over it here and there, so it settles in O's mind!
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