Math Standards.indb
Understand that in adding two-digit numbers, one adds tens and tens, ones and ones; and sometimes it is necessary to compose a ten.Given a two-digit number, mentally find 10 more or 10 less than the number, without having to count; explain the reasoning used.Subtract multiples of 10 in the range 10-90 from multiples of 10 in the range 10-90 ... ................
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