How to Prevent Excel from Removing Leading & Trailing Zeros
Two Methods:
Excel automatically removes leading zeros, as well as trailing zeros after a decimal point. If this disrupts your ability to store data such as postal codes, you can import the data as text so it appears exactly as entered. If you need to use the data in calculations, set it to display in a custom format instead. Custom formats have a slightly higher learning curve, but you only need the basics to bring your zeros back home.
Steps
Storing Numbers as Text

Add an apostrophe before the number.If you only need to correct a few cells, you can fix them one at a time. Edit each cell to start with an apostrophe ('), then type the number exactly as it should appear. The apostrophe tells Excel to store this cell as text, meaning it cannot be used for formulas.
 If you need to use the numbers in formulas, .

Save a large database in text format.Once you import data into a default Excel workbook, the leading and trailing zeros disappear permanently. The easiest way to fix this is to clear the faulty data and start again. Return to your original database and save it as a .csv file or a .txt file.

Create a new Excel workbook.You will import your data into this workbook as text, meaning it will not be usable in formulas. You will, however, keep the formatting.
 This method does allow you to import some columns as text and some columns as numbers. Only the text columns will keep leading and trailing zeros.

Open the Text Import Wizard.Click the tab on your ribbon menu, then look in the External Data Sources section. Click the icon labeled orFrom Text.

Import data from the text document.Select the text file in the "Choose a File" window. Follow the onscreen instructions to complete Steps 1 and 2.

Set columns to text format.In Step 3 of the Text Import Wizard, you should see a preview of your spreadsheet. Click on a column to select it, then select an option to set the format for that column. Specifically, to keep leading and trailing zeros in columns containing phone numbers and similar data, select those columns and choose . You can now complete the import and load your spreadsheet with the zeros, as intended.
Creating Custom Number Formats

Select the cells you need to change.A custom number format specifies the exact format for your data, including the number of leading or trailing zeroes. To begin, select the columns, rows, or groups of cells you'd like to change.

Open the Format window.Click the tab on the ribbon and look in the Number group. On Excel for Windows, click the dialog launcher next to the word Number (a small arrow in a square).On Excel for Mac, click the dropdown menu (it says General by default) and selectCustom....
 On old versions of Excel without a ribbon menu, instead clickFormat→Cells→Numbertab.

Create a custom format.In Excel 2013 and Excel 2019, just select any format on the list. When you edit that default format, Excel will automatically create a new custom format without altering the default option.On all other versions of Excel, selectCustomfrom the list of options instead. Look for a text box labeled Type where you can enter your custom format.
 If your data represents calendar dates, phone numbers, or other common data types, browse the list of default options. You may be able to use one of them rather than creating your own format.

Add leading zeroes.Custom formats use several "placeholder characters" to specify how digits should display. The character 0 (zero) tells Excel to display a zero in that position if there is no other digit there.For example, the format 000 will add leading zeroes to the hundreds and tens place if necessary. 97 will display as 097, and 3 will display as 003.
 Numbers to the left of the decimal point are always displayed. Even though there are only three digits in the format code 000, the number 3750 will still display as 3750.

Specify decimal places and trailing zeroes.Custom number formats will delete all digits after the decimal point unless you specify otherwise. To change this, just add a decimal point to the end of your custom code, followed by 0 (or one of the placeholder characters described below).For example, 000.000 will round to the nearest thousandth, and add up to three trailing zeros after the decimal point. Here's how various numbers look in the 000.000 format:
 13.1 becomes 013.100
 95001 becomes 95001.000
 5.0057 becomes 5.006

Use the pound sign to prevent extra zeroes.The symbol # is another placeholder character in custom formats. This will prevent all leading zeroes if used at the front of the number, and prevent all trailing zeroes if used after the decimal point.For example, the custom format 00.## allows for a leading zero in the tens place, but no trailing zeroes:
 5.8 becomes 05.8
 2.71 becomes 02.71
 15.0 becomes 15
 38.315 becomes 38.32

Add leading zeros as text.Excel treats anything inside quotation marks as text in your custom format, and will display it exactly as you typed it.This may be useful if each cell in your original database had exactly two leading zeros, for example. To restore these, set your spreadsheet to the custom format "00"#.
 If your data includes digits after a decimal point, prevent rounding by using the custom format "00"#.## instead, using as many # or 0 characters after the decimal point as necessary.

Align decimal points with a question mark.If your goal is to align the decimal points in a column, there's no need to add leading or trailing zeroes. Use the ? character in your custom format, and Excel will add empty spaces instead to align the digits in the column. For example:
 ?.??? rounds to the nearest thousandth with no trailing zeroes, and aligns the decimal points.
 000.? adds leading zeros up to the thousands place, rounds to the nearest tenth with no trailing zeros, and aligns the decimal points.
 ?.00 rounds to the nearest hundredth with trailing zeros and aligns the decimal points.
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 Once you've created a custom number format, you can find it again in that workbook's list of formats.
 Excel has a 15 digit limit for numbers. Anything 16 digits or larger will be rounded no matter what format you use.To solve this problem for phone numbers, credit card numbers, and other numerical codes that do not represent actual values, convert the spreadsheet to text.
 The asterisk symbol * in custom codes instructs Excel to repeat the next character any number of times until the cell width is filled. For example, the format *0# adds any number of leading zeros, and the format #.#*0 rounds to the tenths place, then adds any number of trailing zeros.
Video: MS Excel: How to keep leading zeros
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Date: 04.12.2018, 19:42 / Views: 74395