Ordinal numbers
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First, Second, Third, Fourth, Fifth, Sixth, Seventh, Eighth, Ninth, Tenth
Some number x is added to 7 for every number in the sequence. So, the second number is 7+x, the third number is 7+2x... So the tenth number is 7+9x = 34. Solve for x, x=3. The fifth number is 7+4x, which is 7+(4*3), which is 19
The 6s in the number 7,664 are in the hundred and the tenth spot.
The tenth number is ten. The number ten is the tenth digit in the numbering system that is used in most of the world. This number is also the second place in a series of numbers beginning with the ones followed by the tens and hundreds.
One half of a fifth is equivalent to one-tenth. To find one half of a number, you divide the number by 2. In this case, a fifth is equal to 1/5, so dividing 1/5 by 2 gives you 1/10, which is one-tenth.