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The number 1 has some very special properties. It is an important part of the identity property of multiplication. It just says that any number multiplied by 1 will equal that number. Watch this video for more examples of the identity property of multiplication.
Source: Khan Academy, https://youtu.be/6nZp2QGeQ9k This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 License.