There is no "the" rational" number since there is an infinity of them. Start with the number halfway between the two: (1/10+1/11)/2 = 21/220. Then try halfway between 1/10 and 21/220, and then halfway between 1/10 and that on. And so on.
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In the US: PSAT: 11th grade (and sometimes 10th for extra practice). SAT: Usually 11th grade. PLAN: 10th grade. ACT: Usually 11th grade. AP Tests: 9th - 12th grades.
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5 to the 21st power
999 is the final year of the 10th century 1000 is the first year of the 11th century.
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