The 9 in the first number is a thousand times as large.
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There is no difference. In both cases, the place value, of any digit, is ten times the place value of the digit to its right.
The commas between numbers in place value are commas.
The two numbers, to one decimal place, on either side of 3.36 are 3.3 and 3.4 The [absolute] difference between 3.36 and these numbers is: 3.36 - 3.3 = 0.06 and 3.4 - 3.36 = 0.04 Of these, the second difference is smaller which means that 3.36 is nearer to 3.4.
Zero is needed in numbers for positional place value purposes because it tells us that there is a difference between for example 27 and 207
A proportion is simply a ratio of one number to another. An equation can be any or all of the mathematical operations taking place on numbers or variables.