Underlining is used in questions asked about decimals, not in decimal notation.
A bar across the top of a decimal number means that the number (or numbers) are repeated infinitely as the decimal equivalent of a fraction, such as 1/3 (0.3333) or 1/7 (0.142857142857142857).
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"Write the place and the value of the underlined digit" is a math instruction that requires identifying the position of a specific digit within a number and determining its value based on that position. The "place" refers to the position of the digit within the number, such as ones, tens, hundreds, etc. The "value" is the numerical worth of that digit based on its place within the number. This task helps students understand the concept of place value and how digits contribute to the overall value of a number.
The decimal complement of the number 1 is 8. You can find the complement of any digit by subtracting it from the largest single digit value in the base that you're working in.
This is because we use the decimal system which is based on the fact that the place value of any digit is ten times that of the digit to its right.
A decimal number is simply a way of representing a number in such a way that the place value of each digit is ten times that of the digit to its right.So, a number such as 12.345= 1*10 + 2*1 + 3*1/10 + 4*1/100 + 5*1/1000.
A decimal number is simply a way of representing a number in such a way that the place value of each digit is ten times that of the digit to its right. Thus 56.789 = 5*10 + 6*1 + 7*1/10 + 8*1/100 + 9*1/1000