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Multiplying by 1

Any number multipled by 1 will equal to itself.

For example, $999*1=999$ . Same number as the start.

Multiplying by 0

Any number multipled by $0$ will equal $0$ .

For example, $999*0=0$ . We always get $0$ no matter what we multiply $0$ by.

Any number that has $0$ added to it, will equal to itself.

For example, $999+0=999$ . Same number as the start.