Writing numbers in the expanded form, as '10a + b' or '100a + 10b + c'.
In grade 6, you learnt how to check divisibility by the following divisors: 10, 5, 2, 3, 6, 4, 8, 9, 11. You would have found the tests easy to do, but you may have wondered at the same time why they work. Now, in this chapter, we shall go into the “why” aspect of the above.
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