Amid coronavirus, parents are looking for long division refreshers. As parents around the nation are suddenly placed in the role of a teacher, it seems many are struggling with one particular lesson: ...
The number 1 has one digit and is divisible by 1; 12 has two digits and is divisible by 2; 123 has three digits and is divisible by 3. Which new digit (not already used) can be added to the end of 123 ...
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