# How can I do this? MATH GAmE!

``` var start = 1 * 31; Number.prototype.toMinutesAndSeconds = function() {         var nbr = Math.floor(this / 60);         return (nbr+":")+(((nbr=(this-(nbr*60)))<10)?"0"+nbr:nbr); } function display(seconds, output) {         output.innerHTML = (--seconds).toMinutesAndSeconds();         if(seconds > 0) {                 window.setTimeout(function(){display(seconds, output)}, 1000);         } else {                 alert("SE ACABO TU TIEMPO!");         } } display(start, document.getElementById("countdown"),'segundos '); <!DOCTYPE html> <html> <head> <SCRIPT LANGUAGE="JavaScript"> <!-- Original:  Anja Henseler --> <!-- Web Site:  http://www.hens.com/binoculars --> <!-- Begin correct=0; wrong=0; function random(maxValue) { day= new Date(); hour= day.getHours(); min=day.getMinutes(); sec=day.getSeconds(); mili=day.getTime() return(((hour*3600)+(min*60)+(sec)+mili) % maxValue); } function ranom(maxValue) { day= new Date(); mil=day.getTime(); return((mil) % maxValue); } function add() { if(document.quizform.arithmetic[0].checked) maxValue=10; else { if(document.quizform.arithmetic[1].checked) maxValue=30; else { maxValue=60;   } } numA=random(maxValue); numB=ranom(maxValue); numC=numA + numB; Answer=window.prompt(  numA + "+"  + numB +  " = ", ""); ans(); alert('cayate!!!!'); } function subtract() { if(document.quizform.arithmetic[0].checked) maxValue=10; else {if(document.quizform.arithmetic[1].checked) maxValue=30; else { maxValue=60   } } numA=random(maxValue); numB=ranom(maxValue); numC=numA - numB; Answer=window.prompt(  numA + "-"  + numB+  " = ", 0); ans() } function divide() { if(document.quizform.arithmetic[0].checked) maxValue=10; else { if(document.quizform.arithmetic[1].checked) maxValue=30; else { maxValue=60   } } numA=random(maxValue)+1; numB=ranom(maxValue)+1; numC=numA / numB; numC=Math.round(numC) window.alert("Please round your answer off:\n" +".5 or higher rounds one number up\n" +".4 or lower rounds one number down"); Answer=window.prompt(  numA + "/"  + numB +  " = ", 0); ans() } function multiply() { if(document.quizform.arithmetic[0].checked) maxValue=10; else { if(document.quizform.arithmetic[1].checked) maxValue=30; else { maxValue=60   } } numA=random(maxValue); numB=ranom(maxValue); numC=numA * numB; Answer=window.prompt(  numA + "*"  + numB +  " = ", 0); ans(); } function check() { if ((correct+wrong) != 0) { score = "" + ((correct / (correct + wrong)) * 100); score = score.substring(0,4) + "%"; alert("YOUR SCORE:  " + score + "\n" + correct + " correct\n" + wrong + " incorrect") } else alert("You have not completed any exercises yet."); } function ans() { if (Answer == numC) { correct++; msg = "Congratulations, your answer is correct."; } else { wrong++; msg = "Oops!  " + Answer + " is incorrect.\n\n" + "The correct answer was " +numC + ".";   } score = "" + ((correct / (correct + wrong)) * 100); score = score.substring(0,4) + "%"; alert(msg + "\n\nYOUR SCORE:  " + score + "\n" + correct + " correct\n" + wrong + " incorrect") } //  End --> </script> <title>MEMO MATH TEST</title> </head> <body> <div id="border2"> </div> <div id="border"> <center> <form name=quizform> <input type=button value="add" onClick="add()"> <input type=button value="subtract" onClick="subtract()"> <input type=button value="multiply" onClick="multiply()"> <input type=button value="divide" onClick="divide()"> <br> <br> <input type="radio" name="arithmetic">Easy <input type="radio" name="arithmetic" checked>Moderate <input type="radio" name="arithmetic">Difficult <br> <br> <input type=button value="Check Score" onClick="check()"> <input type=button value="Reset Score" onClick="javascript:correct=0;wrong=0;"> </form> </center> </div> </body> </html>```