Answer :
Let's solve each part of the student's questions step-by-step.
Subtracting 9999 from 19999:
To find the result of subtracting 9999 from 19999, you perform the simple subtraction:
[tex]19999 - 9999 = 10000[/tex]
So, the result is 10000.
Reducing a number by 20000:
If you want to reduce a number by 20000, you subtract 20000 from that number. For example, if your number is represented as [tex]x[/tex], then the operation would be:
[tex]x - 20000[/tex]
This subtraction will give you the new value after the reduction.
These examples illustrate basic arithmetic operations, which are foundational skills in mathematics, often covered in middle school.