The Number input block allows you to ask your user for a number. You can configure a minimum, a maximum and a step:
Flow View:
Bot View:
Format
This only affects how the number is displayed to the user when they submitted the answer in a bot.
You can choose the format for the captured number. By default, the number is formatted as a decimal value following user's locale preferences. You can override this behavior to format it as a currency, a percentage, a scientific number, etc.