When they are closest to each other, Earth and Saturn are 1.2 billion kilometres apart.Real-life contexts can provide an understanding of the magnitude of large numbers.Some numbers have cultural significance. Every strand of mathematics relies on numbers.For example, 1 billion is 1000 times greater than 1 million. Numbers can be compared by their place value or they can be compared using proportional reasoning.For example, the number 7 238 025 may be rounded to 7 million, or 7.2 million or 7.24 million, depending on the amount of precision needed. Sometimes an approximation of a large number is used to describe a quantity.1 billion millimetres is equal to 1000 kilometres.Numbers can be written in terms of another number.Numbers without units identified are assumed to be based on ones.Expanded notation with powers of ten shows a number as an expression by using addition, multiplication, and exponents.Large numbers may be expressed as a decimal number with the unit expressed in words. Reading numbers involves interpreting them as a quantity when they are expressed in words, in standard notation, or in expanded notation using powers of ten.For example, in the number 876 345 107, the digit 8 represents 8 hundred millions, the digit 7 represents 7 ten millions, the digit 6 represents 6 millions, the digit 3 represents 3 hundred thousands, the digit 4 represents 4 ten thousands, the digit 5 represents 5 thousands, the digit 1 represents 1 hundred, the digit 0 represents 0 tens, and the digit 7 represents 7 ones. They are referred to as the digits in a number and each digit corresponds to a place value.
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