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To round 847 to the nearest 10, we look at the digit in the tens place, which is 4. Since 4 is less than 5, we round down. Therefore, 847 rounded to the nearest 10 is 840.
472 is 10 less than 482.
-10
Prime numbers less than 10 are: 2 3 5 and 7
Subtraction of 10 from 2000 gives the required number. 2000 - 10 = 1990 is 10 less than 2000.