Complete the following statements with suitable words or figures.
72+597+28+403=,,,,,,,,,,,,
Step 1; Grouping the given numbers.
=(72+28)+(597+403)=100+1000=1100
18+6+18+7=18×(6+......)
4763-...........=4763
99,999=99,999+...........
800+(,,,,,,,+391)=(........+648)+391
(5-4)-1 ≠ 5-(4-1)
So, ………..property does not hold true for subtraction.