Long division is a mathematical operation that divides one number (the dividend) by another number (the divisor) to find the quotient (the answer). It is a common method for dividing large numbers, especially when a calculator is not available.
There are a few different ways to check long division, but the most common method is to use the remainder. The remainder is the number that is left over after the division has been completed. If the remainder is zero, then the division is exact. If the remainder is not zero, then the division is not exact and the quotient will have a decimal point.