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The problems you missed are listed below with answers / explanations.  Look over the explanation for each problem so you can understand why you missed it!

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'); resetdisplay(); for(var i = 0; i <10; i++) { ganswer[i] = prompt(question[i],""); if (ganswer[i] == "quit" || ganswer[i] == "QUIT" || ganswer[i] == "Quit") { break; } q++; if (ganswer[i] == answer[i]) { c++; } else { rightans[i] = 0; w++; } resetdisplay(); } for(var i = 0; i < 10; i++) { if (rightans[i] == 0) { expl = expl + explain[i]; } } parent.frames[0].document.write(expl); parent.frames[0].document.write("
"); } question[0] = '(2/3) + (3/2)'; question[1] = '(8/9) - (7/6)'; question[2] = 'Find the LCM of 3 and 5'; question[3] = 'Find the LCM of 15 and 5'; question[4] = 'Find the LCM of 9 and 6'; question[5] = 'Find the GCF of 10 and 6'; question[6] = 'Find the GCF of 12 and 8'; question[7] = 'Find the GCF of 30 and 9'; question[8] = '(9/5) * (6/7)'; question[9] = '(6/7) / (5/6)'; answer[0] = '13/6'; answer[1] = '-5/18'; answer[2] = '15'; answer[3] = '15'; answer[4] = '18'; answer[5] = '2'; answer[6] = '4'; answer[7] = '3'; answer[8] = '54/35'; answer[9] = '36/35'; explain[0] = '#1

 2 3 - + - 3 2

Find a common denominator.

 4 9 - + - 6 6

13
--
6

'; explain[1] = '#2

 8 7 - - - 9 6

Find a common denominator.

 16 21 -- - -- 18 18

-5
--
18

'; explain[2] = '#3

 Multiples of 3 Common multiples Multiples of 5 3 5 6 10 15 15 15 18 20 ... ... ...

'; explain[3] = '#4

 Multiples of 15 Common multiples Multiples of 5 5 10 15 15 15 30 20 ... ... ...

'; explain[4] = '#5

 Multiples of 9 Common multiples Multiples of 6 9 6 12 18 18 18 27 24 ... ... ...

'; explain[5] = '#6

 Factors of 10 Common factors Factors of 6 1 1 1 2 2 2 3 5 6 10

'; explain[6] = '#7

 Factors of 12 Common factors Factors of 8 1 1 1 2 2 2 3 4 4 4 6 8 12

'; explain[7] = '#8

 Factors of 30 Common factors Factors of 9 1 1 1 2 3 3 3 5 6 9 10 30

'; explain[8] = '#9

 9 6 - * - 5 7

54
--
35

'; explain[9] = '#10

 6 5 - / - 7 6

Flip (take the reciprocal of) the divisor.

 6 6 - * - 7 5

36
--
35

'; rightans[0] = 1; rightans[1] = 1; rightans[2] = 1; rightans[3] = 1; rightans[4] = 1; rightans[5] = 1; rightans[6] = 1; rightans[7] = 1; rightans[8] = 1; rightans[9] = 1; //-->