There are only 10 combinations. In each combination one of the 10 digits is left out.
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In mathematics, the number 3 is equivalent to 3.00. When comparing 3 to 09, it's important to note that the leading zero in 09 does not affect the value of the number. Therefore, 3 is greater than 09 because 3 is equal to 3.00, while 09 is equal to 9.
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Switch the two numbers round then take away the smaller number from the bigger one: 67-76 76- 67= 09 09-90 90- 09= 81 etc
.9, you look at the first number after the decimal point and find which number is bigger, then if they are the same you go to the next number and find which one is larger and so on.
The number 78,909 rounded to the nearest ten thousand would be 79,000. This is taught in math.