64 or 123
These digits can be represented based on their Place Value Notation.
They make the numbers invisible to the people at Answers.com, possibly.
When using front-end estimation, first you add the front-end digits. Then adjust by estimating the sum of the remaining digits. Then add the two values
The correct answer is "expanded form".
64 or 123
256 (162)
4 these are 00,01,10 and 11...
Some common tools used to represent decimal values include: Decimal notation: This is the most common and widely used way to represent decimal values, using a decimal point followed by digits from 0-9. Fraction notation: Decimal values can also be represented as fractions, where the numerator is the decimal value and the denominator is a power of 10. Scientific notation: Decimal values can be represented in scientific notation, where a number between 1 and 10 is multiplied by a power of 10. This is particularly useful for very large or very small decimal values.
These digits can be represented based on their Place Value Notation.
The different digits have different values.
With 6 binary digits, you have 26 different possibilities. This is because there are two possibilities for each digit, and each digit is independent of the other digits - so you just multiply the possibilities for each digit together.
A decimal digit requires 4 bits of memory space to represent all possible values. So N decimal digits will require 4N bits to store in decimal format. On the other hand, if the same N decimal digits were stored as a binary number, they should require log2(10N) bits, that is, about 3.32N bits. So storing the decimal representation uses about 20% more memory. To put it another way, 4 bits is capable of holding one of 16 different values. By using it to store decimal digits, it is only being used to hold one of 10 different values.
24, or 16 (0 through 15) One binary digit (bit) can have 21 values (0 or 1). Two bits can have 22 values. Three bits can have 23 values. A five-bit number can have 25 values... and so on...
The two sets of digits have different place values.
infinite number of digits after the decimal point -- pi does not have a finite value.
Advantage of binary over decimal: information can be recorded and stored in any dichotomous variable: magnetised or not magnetised (most electronic media), pit or no pit (optoelectronic media CDs/DVDs). For decimal it would be necessary to store as 10 different levels of magnetisation or depths of pits. Not so easy to make such a system error-free. Advantage of decimal over binary: fewer "digits" required. Every ten binary digits (1024 values) can be replaced by just a shade more than three decimal digits (1000 values). So the number of digits to be stored is less than a third.