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In this video, we will look at numbers and figures
and talk about what differences there are between them.
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We will also do a few examples in order to get used to
the concepts of digits and numbers.
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Think of digits as building blocks of a number.
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Numbers are built on digits in the same way as words are built on letters.
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The digits that we use today are 1, 2, 3, 4, 5, 6, 7,
8, 9 and 0.
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All possible numbers are built on these ten digits.
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For example, the number 1256 is built on the four digits one, two, five and six.
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Since this number is made out of four digits, we call this number a four-digit number.
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We will do two more examples on numbers and digits.
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Here we use the numbers 1, 9, 6, 2 and 3 to create
a number as close to 10,000 as possible.
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Because we have five digits, we will get a
five-digit number.
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We write it out as five blank squares.
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The first digit needs to be as close to 1 as possible, since it is supposed to match the one in 10 000.
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The second number needs to be as close to 0 as possible, since the second number of 10,000 is 0.
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We continue in the same way, since it is only the 0´s left in
10 000
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We also want to make sure that the greatest digits are placed in the far end of the number, in order to make the number as small and close to 10 000 as possible.
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In this case we place the numbers in following order; 1, 2, 3, 6 and 9 which create the number 12 369.
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This number is the closest to 10 000 that we can create
out of the given digits.
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In the last example, we are given the digits 1, 2 and 3 to use in a subtraction, where the result is supposed to be 11.
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We visualize this operation by placing two blank squares, and the number 11 on the opposite side of the equal sign.
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Here, the digits 1 and 3 can create the number 13. This number can be subtracted by the 2 that we were left with, and our result will be equal to 11.