There is no smallest decimal - just as there is no largest number.
If x was said to be the smallest decimal, inserting a zero immediately after the decimal point would give a number equal to a tenth of x - ie smaller than x.
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There is no smallest decimal in the world because decimals can be infinitely small by adding more decimal places.
To order decimals from smallest to largest, start by comparing the digits to the left of the decimal point. If they are the same, move to the first digit to the right. Continue this process until you can determine the order of the decimals. Remember, the decimal point separates the whole number from the fractional part, with smaller numbers appearing to the left of larger numbers.
The uncertain figure of 2.423 would be the thousandths place, as it is the last digit given after the decimal point and represents the smallest decimal place indicated.
When adding or subtracting numbers, the result should have the same number of decimal places as the least number of decimal places in the original numbers. This is because in these operations, you are limited by the least precise measurement. Significance figures don't matter in addition or subtraction, only decimal places.
0.2 equals 2 tenth (2/10), while 0.02 equals 2 one-hundredths (2/100) which makes 0.02 the smaller number