Magento 2.4 – Installation Issue

While installing magento2.4 using composer with php 7.4 I'm getting below message

Problem 1

- Installation request for magento/product-community-edition 2.4.0 -> satisfiable by magento/product-community-edition[2.4.0].
- magento/product-community-edition 2.4.0 requires ext-bcmath * -> the requested PHP extension bcmath is missing from your system.

To enable extensions, verify that they are enabled in your .ini files:

- /etc/php/7.4/cli/php.ini
- /etc/php/7.4/cli/conf.d/10-mysqlnd.ini
- /etc/php/7.4/cli/conf.d/10-opcache.ini
- /etc/php/7.4/cli/conf.d/10-pdo.ini
- /etc/php/7.4/cli/conf.d/15-xml.ini
- /etc/php/7.4/cli/conf.d/20-bz2.ini
- /etc/php/7.4/cli/conf.d/20-calendar.ini
- /etc/php/7.4/cli/conf.d/20-ctype.ini
- /etc/php/7.4/cli/conf.d/20-curl.ini
- /etc/php/7.4/cli/conf.d/20-dom.ini
- /etc/php/7.4/cli/conf.d/20-exif.ini
- /etc/php/7.4/cli/conf.d/20-ffi.ini
- /etc/php/7.4/cli/conf.d/20-fileinfo.ini
- /etc/php/7.4/cli/conf.d/20-ftp.ini
- /etc/php/7.4/cli/conf.d/20-gd.ini
- /etc/php/7.4/cli/conf.d/20-gettext.ini
- /etc/php/7.4/cli/conf.d/20-iconv.ini
- /etc/php/7.4/cli/conf.d/20-imagick.ini
- /etc/php/7.4/cli/conf.d/20-imap.ini
- /etc/php/7.4/cli/conf.d/20-intl.ini
- /etc/php/7.4/cli/conf.d/20-json.ini
- /etc/php/7.4/cli/conf.d/20-mbstring.ini
- /etc/php/7.4/cli/conf.d/20-mysqli.ini
- /etc/php/7.4/cli/conf.d/20-pdo_mysql.ini
- /etc/php/7.4/cli/conf.d/20-phar.ini
- /etc/php/7.4/cli/conf.d/20-posix.ini
- /etc/php/7.4/cli/conf.d/20-readline.ini
- /etc/php/7.4/cli/conf.d/20-shmop.ini
- /etc/php/7.4/cli/conf.d/20-simplexml.ini
- /etc/php/7.4/cli/conf.d/20-soap.ini
- /etc/php/7.4/cli/conf.d/20-sockets.ini
- /etc/php/7.4/cli/conf.d/20-sysvmsg.ini
- /etc/php/7.4/cli/conf.d/20-sysvsem.ini
- /etc/php/7.4/cli/conf.d/20-sysvshm.ini
- /etc/php/7.4/cli/conf.d/20-tokenizer.ini
- /etc/php/7.4/cli/conf.d/20-xmlreader.ini
- /etc/php/7.4/cli/conf.d/20-xmlrpc.ini
- /etc/php/7.4/cli/conf.d/20-xmlwriter.ini
- /etc/php/7.4/cli/conf.d/20-xsl.ini
- /etc/php/7.4/cli/conf.d/20-zip.ini

You can also run php --ini inside terminal to see which files are used by PHP in CLI mode.

How can I solve it.