Rounding decimal number calculator that shows work to find the nearest whole number, ten, hundred, thousand, ten thousand, one-tenth, one-hundredth, one-thousandth and so on by estimation. The step-by-step calculation help parents to assist their kids studying 4th, 5th or 6th grade to verify the steps and answers of rounding to the nearest integer, 10, 100, 1000, 10000, 1/10th, 1/100th and 1/1000th homework and assignment problems in pre-algebra or in number and operations in base ten (NBT) of common core state standards (CCSS) for mathematics.