document.write( "Question 1029343: How many 3-digit numbers are multiple of 21?
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Algebra.Com's Answer #644371 by ikleyn(52794) $\"\"$ $\"About$

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document.write( "First such number is  105.\r\n" );
document.write( "Last  such number is  987.\r\n" );
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document.write( "How many intervals by 21 integer numbers are between these two numbers?\r\n" );
document.write( "It is\r\n" );
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document.write( " = 42.\r\n" );
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document.write( "So, there are 42 intervals.\r\n" );
document.write( "Hence, the number of multiples 21 from 105 to 987 inclusively is 42 + 1 = 43.\r\n" );
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document.write( "Answer. There are 43 multiples of 21 that are 3-digit integers.\r\n" );
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