Calculate 99999+9999+999+99+9=_____
99999999999999+9______111105______
Hence, the sum of 99999+9999+999+99+9 is 111105
Observe the patterns and fill in the blanks:
116+9=116+10-1=115+10
116+99=116+100-1=115+100
116+999=116+1000-1=115+________________
116+9999=116+10000-1=115+_____________________