10 1+78 is equal to 179. 10 1 ten 78 equals 179, which is just a simple math problem. 10 1 178 is also an algebra problem, which is equal to 179. Here 10 1 and 78 are both self numbers, and 10 1 178 is equal to 178, which is also a natural number. If you add units, 10 1 yuan 10 78 yuan is equal to 179 yuan, which means unit operation, so those with units are called unit operation, and those without units are called algebraic operation.