why do they put a line through the number 7?
956209
To make it more noticable that it is not a 1.
527962
The $ sign is always before the number.\nOnly when pounds or rupees or pesos or yuan or yen... are spelt out, then they are behind the number.
19284
It's a notational convenience.\n\n1) It helps avoid the problem of running out of unique symbols when working with a large, possibly infinate, set of variables.\n\n2) It provides a way to keep track of ordering in a set of variables when that ordering makes a difference.\n\n3) It makes it possible to express the values of a sequence of variables when their value depends on their position in the sequence. An example would be the Fibonacci sequence where each number in the sequence is the sum of the two previous numbers (the first two being defined as 1). It can be expressed as: \n\na(sub)1 = 1\na(sub)2 = 1\na(sub)n = a(sub)(n-1) + a(sub)(n-2)
924861
You put a round bracket "()" on the number line when the sequence doesn't include the number where that bracket goes. For example, if the final answer you get is "all the numbers between 2 and 8, excluding 2 and 8" then you use the round brackets. You'll know your answer excludes a number or numbers because it will be "bigger than" or "smaller than" only, not "bigger than or equal to" or "smaller than or equal to", in other words, ther will be no line underneath the inequality sign. \nNow, if you do get something like "x is bigger than or equal to  8 and smaller than or equal to 2" than you know your answer includes 2 and 8, so you use the brick bracket, "[ ]". Good luck.
64606
It probably just made more sense to describe the amount and then the currency.  I see some written descriptions outside the US use the currency symbol afterward, like 637$.  Maybe we should all start doing it...:-)
286367
Take the last number off, double it, and subtract it from the rest of the number.  If that is divisible by 7, then the original number is.\n\nFor example 2457\n\n2457 is 245 & 7; 7*2 = 14\n245-14=231\n\nNot sure?  do it again\n\n231 is 23 & 1; 1*2 = 2\n23 - 2 = 21; this is divisible by 7, so 2457 is also divisible by 7.
685370
you write the digits and then draw the bar above the repeating ones.  for example, if you wanted to write out 1 1/3 as a decimal, you would notice that it is 1.333333... so it would be written as 1.3 or (more often) 1.33, with a bar over only the "3"s.  if it is a number such as 2.345676767676... the bar would go above only the first set of "67," and not over the 3, 4, or 5, since they don't repeat.  some numbers may have only one repeating digit, and others may have many.  the bar goes over the first repetition only, and is not used in cases where there are other numbers that do not repeat interrupting the pattern
26758
Why would it be 11, 10, 12?  It's 0, 1, 2, not 1, 0, 2.\n\nThe second digit (the 1 in 10) is the tens place, and the first digit (the 0 in 10) is the ones place, so after 9 you have no more digits to put a higher number in the ones place, so you put a 1 in the tens place and a 0 in the ones place and get 10.  To add one to that you put a 1 in the ones place and get 11.  Thus 11 is one more than 10 so it comes after it when you arrange the numbers from smallest to largest (which is essentially what you're doing when you're counting).
619440
7 will be after five\nand eight will be after six.\n\nReason: The upper numbers in 'numerals' contains straight lines, the lower one contains curves.\nWell...
202442
When people talk about something being xdigits of money, they are referring very vageuly to the amount of money.  Basically, they are referring to the number of digits in the number.  If you refer to something being in the six digits, you are saying that it is at least 100,000 because that is how many digits are in that number.  A seven digit number would be millions: 1,000,000.  Eight would be tens of millions: 10,000,000.
924806
It is called absolute value.\n\nIt basically means that if you drew out a number line, how many spaces would the number between the lines be from zero?\n\nFor example, |4| is 4, because 4 is 4 places away from 0\n\nand |-27| is 27, because negative 27 is twenty seven places away from zero\n\nkeep in mind, that an absolute value equation can never equal a negative number
345909
Rearranged letters you have China which is a name of country.\n2 does not belong to the line because when you subtract two contiguous numbers you must get a number which can be divided by 3. (2-4=-2;-2 cannot be divided by 3 equally)
297702
because it comes after 7
429250
I think it is something that placed in a way that from \nright to left (flat way) or so but not from up to down or down to up.\nexample: ------------------------- horizontal line
272340
To scare six?\n\n"Why is six afraid of seven?\nBecause seven eight nine."
471834
aren't u missing a number there on the last row???\n\nin that case... i would say...\n\n9 11 13 15 17 19....
268911
since no one else will explain it, if u have 7a-5<9. then u have to add five to both sides to get rid of it on the left side. so that makes 7a<14. then to get a by it self, u have to divide both sides by 7. so u get a<2.