When you add a 1-digit number to a 3-digit number, the same rules apply as when you are adding a 1-digit number to a 1 or 2-digit number. Number lines, partitioning, Base 10 and the column method ...

As Lexington celebrates its 250th birthday, we look at why, how and when the city switched phone numbers from five digits to seven.

In order to accommodate the gradual exhausting of three-digit combinations, the University Registrar’s Office began the ...

They call Alex Ovechkin 'The Great 8.' And the Washington Capitals' legendary goalscorer has now reached the greatest 8s he ...

When you add a 1-digit number to a 3-digit number, the same rules apply as when you are adding a 1-digit number to a 1 or 2-digit number. Number lines, partitioning, Base 10 and the column method ...