How can I multiply 523 by 64 in a calculator if the 3 button is broken

How can I multiply 523 by 64 in a calculator if the 3 button is broken?
Sep 6­11:26 AM
How can I multiply 325 by 78 in a calculator if the 2 button is broken?
Sep 6­11:26 AM
1
How can I divide the 434 by 42 with a calculator if the 4 button is broken?
Sep 6­11:31 AM
Show how to evaluate the following expression on a calculator if the 6 button is broken on the calculator.
2
2
6 + √36 ­ 6 + 2
Sep 6­6:58 AM
2
the 8 is broken
Sep 6­1:47 PM
3