7, 28, 49, 63, 105 is the series of multiples of 7 using 0-9 only once.
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The last digits of each number are counting down as the first digits are counting up. 09, 18, 27, 36, 45, 54,63, 72, 81, 90, 99, 108
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.
.9 is bigger than .09. Think about money. If you had 5.90, that is better than 5.09, right? Ninety cents is a lot more than nine cents.
01 = 16 02 = 64 03 = 256 04 = 1,024 05 = 4,096 06 = 16,384 07 = 65,536 08 = 262,144 09 = 1,048,576 10 = 4,194,304 11 = 16,777,216 12 = 67,108,864 13 = 268,435,456 14 = 1,073,741,824 15 = 4,294,967,296 16 = 17,179,869,184 17 = 68,719,476,736 18 = 274,877,906,944 19 = 1,099,511,627,776 20 = 4,398,046,511,104
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