Rounding to the Nearest Tenth Calculator

Rounding to the Nearest Tenth Calculator

The rounded result is:

What is Rounding to the Nearest Tenth?

Rounding to the nearest tenth involves looking at the digits of a decimal number and simplifying it to have only one digit after the decimal point. This is often necessary in scientific calculations, financial estimations, and everyday math to make numbers easier to work with without losing significant accuracy.

How to Use the Rounding Rules

To round a number manually to the nearest tenth, you must look at the hundredths place (the second digit to the right of the decimal point):

• If the hundredths digit is 5 or greater: Round up the tenths digit by 1 and drop all digits to the right.
• If the hundredths digit is less than 5: Keep the tenths digit as it is and drop all digits to the right.

Step-by-Step Examples

Original Number	Process	Rounded Result
4.78	Hundredths is 8 (≥5), round up 7.	4.8
12.134	Hundredths is 3 (<5), keep 1.	12.1
0.95	Hundredths is 5 (≥5), round up 9.	1.0

Why use a tenth rounding calculator?

While the manual rules are straightforward, errors often occur when dealing with negative numbers or numbers where the tenths place is a 9 (causing a carry-over into the whole number). Our calculator handles these edge cases instantly, ensuring your data remains precise and mathematically sound.

function calculateRounding() { var inputVal = document.getElementById("numberInput").value; var resultDiv = document.getElementById("resultArea"); var resultDisplay = document.getElementById("roundingResult"); var explanationDisplay = document.getElementById("roundingExplanation"); if (inputVal === "" || isNaN(inputVal)) { alert("Please enter a valid number."); return; } var num = parseFloat(inputVal); // Math logic for rounding to the nearest tenth // We multiply by 10, round to the nearest whole number, then divide by 10 var rounded = Math.round(num * 10) / 10; // Format to ensure at least one decimal place is shown if it was a .0 result var displayFormatted = rounded.toLocaleString(undefined, { minimumFractionDigits: 1, maximumFractionDigits: 1 }); resultDisplay.innerHTML = displayFormatted; // Create a small explanation based on the value var decimalPart = Math.abs(num % 1); var hundredths = Math.floor((decimalPart * 100) % 10); if (hundredths >= 5) { explanationDisplay.innerHTML = "Since the hundredths digit was " + hundredths + ", we rounded up."; } else { explanationDisplay.innerHTML = "Since the hundredths digit was " + hundredths + ", we kept the tenths digit the same."; } resultDiv.style.display = "block"; }