
Elementary Math Fractions, Percentages, Word Problems, Equations, Inequations, Factorization, Expansion 
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November 9th, 2015, 06:52 AM  #11  
Senior Member Joined: Apr 2015 From: Barto PA Posts: 170 Thanks: 18  Quote:
that others have tried to get you to see, here is a simple way to write such a list: Write it vertically down the page. Start at the extreme upper righthand side of your paper and write a column of alternating 0's and 1's: 010101010101010101010... Write another column down the page to the left of the first column: 00110011001100110011... Another column to the left of the last one: 000011110000111100001111... One more: 00000000111111110000000011111111... Now you should see the pattern (if you already haven't). Just double the number of 0's and 1's in the sequence for each column you write. Your list should look like this (for just 17 num bers including 0): 0  ................000000 1  ................000001 2  ................000010 3  ................000011 4  ................000100 5  ................000101 6  ................000110 7  ................000111 8  ................001000 9  ................001001 10  ................001010 11  ................001011 12  ................001100 13  ................001101 14  ................001110 15  ................001111 16  ..............0010000 . . . and so on. It certainly isn't necessary to write such a list if all one wants to do is convert some given basetwo number to decimal.  
November 9th, 2015, 02:07 PM  #12 
Senior Member Joined: Jan 2014 From: The backwoods of Northern Ontario Posts: 393 Thanks: 71 
When you write the first positive integers and zero in base ten, you find that there are ten digits, 0,1,2,3,4,5,6,7,8,9. To express ten, you write 10 which means 1 ten and no ones. eleven is 1 ten and 1 one, etc. After 99, you will need an extra digit, so that you would write 100. The 1 represents 10×10 or a hundred If you were writing the first positive integers and zero in base 4, there are four digits, 0,1,2,3. To express four, you would write 10 which means 1 four and no ones. To express five, you write 11, which is 1 four and 1 one, etc. To write nine, you would write 21, which means 2 fours and 1 one. you will need an extra digit after 33 (3 fours and 3 ones, namely 100. This time the 1 represents 4×4 or a sixteen. 101 seventeen 102 eighteen 103 nineteen 110 twenty (1 sixteen and 1 four) 111 twentyone etc. etc. etc. In writing the first positive integers and zero in base 2 (the binary system) there are two digits, 0 and 1 The number two would be written as 10 which means 1 two and no ones. Three would be written as 11, that is, 1 two and 1 one. After 11, you will need and extra digit, namely 100. This time the 1 represents 2×2 or a four. Thus 101 is 1 four, no twos, and 1 one (five) 110 is 1 four, 1 two, and no ones (six). 111 is 1 four, 1 two, and 1 one (seven). After that you need an extra digit that will represent 2×2×2×2 or eight. Thus 1000 eight 1001 nine 1010 ten 1011 eleven 1100 twelve 1101 thirteen 1110 fourteen 1111 fifteen After that you need an extra digit that will represent 2×2×2×2×2 or sixteen 10000 sixteen etc. etc. etc. You can use the same addition, subtraction, multiplication, and division algorithms in other bases that you normally use in base 10. 

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