var index1=Math.round(Math.random()*(4-1))+1;
var question1=new Array(5);
var truevalue1=new Array(5);
	
question1[0]='9.8637';
truevalue1[0]='9.86';

question1[1]='9.8637';
truevalue1[1]='9.86';

question1[2]='0.00877398';
truevalue1[2]='0.00877';

question1[3]='29.310';
truevalue1[3]='29.3';

question1[4]='2,654,800';
truevalue1[4]='2,650,000';

question1[5]='0.870299';
truevalue1[5]='0.870';

window.document.write('<CENTER><H2><B>Rules for Rounding Off Numbers</B></H2></CENTER><BR><HR><BR><P ALIGN="LEFT"><FONT SIZE=+2>A. If the digit after that being retained is <B>LESS than 5,</B> the retained digit is unchanged.</FONT><BR>If 27.73 is rounded off to three significant figures, the value 27.7 results, since the digit 3 is being dropped.  Likewise, if 144.46 is rounded to three significant figures, the value 144 results, since the digit 4 is being dropped (always look at the first digit after that being retained).</P><P ALIGN="LEFT">Round off the following number to 3 significant figures.</P><TABLE CELLSPACING="0" CELLPADDING="0" ALIGN="CENTER" WIDTH="75%"><TR><TD ALIGN="CENTER">'+ question1[index1] + '<INPUT TYPE="TEXT" SIZE="30" NAME="question1"></TD></TR></TABLE>');

var index2=Math.round(Math.random()*(4-1))+1;
var question2=new Array(5);
var truevalue2=new Array(5);
	
question2[0]='2,548';
truevalue2[0]='2,550';

question2[1]='2,548';
truevalue2[1]='2,550';

question2[2]='52,660.04';
truevalue2[2]='52,700';

question2[3]='3.1270';
truevalue2[3]='3.13';

question2[4]='17,684';
truevalue2[4]='17,700';

question2[5]='0.00049999';
truevalue2[5]='0.000500';

window.document.write('<P ALIGN="LEFT"><FONT SIZE=+2>B. If the digit after that being retained is <B>GREATER than 5,</B> the retained digit is increased by one.</FONT><BR>If 27.76 is rounded off to three significant figures, the value 27.8 results, since the digit 6 is being dropped.  Likewise, if 30.092 is rounded to three significant figures, the value 30.1 results, since the digit 9 is being dropped (always look at the first digit after that being retained).</P><P ALIGN="LEFT">Round off the following number to 3 significant figures.</P><TABLE CELLSPACING="0" CELLPADDING="0" ALIGN="CENTER" WIDTH="75%"><TR><TD ALIGN="CENTER">'+ question2[index2] + '<INPUT TYPE="TEXT" SIZE="30" NAME="question2"></TD></TR></TABLE>');

var index3=Math.round(Math.random()*(4-1))+1;
var question3=new Array(5);
var truevalue3=new Array(5);
	
question3[0]='82.65';
truevalue3[0]='82.6';

question3[1]='82.65';
truevalue3[1]='82.6';

question3[2]='19.950';
truevalue3[2]='20.0';

question3[3]='4,575,000';
truevalue3[3]='4,580,000';

question3[4]='674.50';
truevalue3[4]='674';

question3[5]='0.009555';
truevalue3[5]='0.00956';

window.document.write('<P ALIGN="LEFT"><FONT SIZE=+2>C. If the digit after that being retained is <B>EQUAL to 5,</B> what follows determines how to round the number.</FONT><BR><B>1.</B> If there are <B>no nonzero</B> digits after the 5, the retained digit is made even (round it up if it is odd).</P><P ALIGN="LEFT">If 27.75 is rounded off to three significant figures, the value 27.8 results, since only the digit 5 is being dropped.  Likewise, if 15.350 is rounded to three significant figures, the value 15.4 results, since the digit 5 is being dropped (with nothing but a zero after it).</P><P ALIGN="LEFT">Round off the following number to 3 significant figures.</P><TABLE CELLSPACING="0" CELLPADDING="0" ALIGN="CENTER" WIDTH="75%"><TR><TD ALIGN="CENTER">'+ question3[index3] + '<INPUT TYPE="TEXT" SIZE="30" NAME="question3"></TD></TR></TABLE>');

var index4=Math.round(Math.random()*(4-1))+1;
var question4=new Array(5);
var truevalue4=new Array(5);
	
question4[0]='0.00274506';
truevalue4[0]='0.00275';

question4[1]='0.00274506';
truevalue4[1]='0.00275';

question4[2]='358.5001';
truevalue4[2]='359';

question4[3]='3.0053';
truevalue4[3]='3.01';

question4[4]='9.7851';
truevalue4[4]='9.79';

question4[5]='27.0504';
truevalue4[5]='27.1';

window.document.write('<P ALIGN="LEFT"><B>2.</B> If there are <B>nonzero</B> digits after the 5, the retained digit is increased by one.</P><P ALIGN="LEFT">If 9.2652 is rounded off to three significant figures, the value 9.27 results, since the digit 5 is being dropped, and it is followed by a nonzero digit.  Likewise, if 14,350.02 is rounded to three significant figures, the value 14,400 results, since the digit 5 is being dropped, and it is followed by a nonzero digit.</P><P ALIGN="LEFT">Round off the following number to 3 significant figures.</P><TABLE CELLSPACING="0" CELLPADDING="0" ALIGN="CENTER" WIDTH="75%"><TR><TD ALIGN="CENTER">'+ question4[index4] + '<INPUT TYPE="TEXT" SIZE="30" NAME="question4"></TD></TR></TABLE>');