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<!DOCTYPE html> <html> <body> <p>Floating point arithmetic is not always 100% accurate.</p> <p>But it helps to multiply and divide.</p> <button onclick="myFunction()">Try it</button> <p id="demo"></p> <script> function myFunction() { var x = (0.2*10 + 0.1*10) / 10; document.getElementById("demo").innerHTML = "0.2 + 0.1 = " + x; } </script> </body> </html>