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2 clearer explanation
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Pepe, 31 bytes

rEeEEeeEeeREeEREEEEeeREeEEEReEE

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Basically ceil(n/100).

Explanation:

rEeEEeeEeeREeEREEEEeeREeEEEReEE - full program

rEeEEeeEee                      - push 100 to stack B
          REeE                  - input as number to stack A. float gets rounded.
              REEEEee           - A / B, or A / 100. push in stack A.
                     REeEEE     - ceil(A)
                           ReEE - output stack A as number

Pepe, 31 bytes

rEeEEeeEeeREeEREEEEeeREeEEEReEE

Try it online!

Explanation:

rEeEEeeEeeREeEREEEEeeREeEEEReEE - full program

rEeEEeeEee                      - push 100 to stack B
          REeE                  - input as number to stack A. float gets rounded.
              REEEEee           - A / B. push in stack A.
                     REeEEE     - ceil(A)
                           ReEE - output stack A as number

Pepe, 31 bytes

rEeEEeeEeeREeEREEEEeeREeEEEReEE

Try it online!

Basically ceil(n/100).

Explanation:

rEeEEeeEeeREeEREEEEeeREeEEEReEE - full program

rEeEEeeEee                      - push 100 to stack B
          REeE                  - input as number to stack A. float gets rounded.
              REEEEee           - A / B, or A / 100. push in stack A.
                     REeEEE     - ceil(A)
                           ReEE - output stack A as number
1
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Pepe, 31 bytes

rEeEEeeEeeREeEREEEEeeREeEEEReEE

Try it online!

Explanation:

rEeEEeeEeeREeEREEEEeeREeEEEReEE - full program

rEeEEeeEee                      - push 100 to stack B
          REeE                  - input as number to stack A. float gets rounded.
              REEEEee           - A / B. push in stack A.
                     REeEEE     - ceil(A)
                           ReEE - output stack A as number