Wouldn't it be nice, if you can have all those three sheets of workbook open side by side?
Did you know that there is an easy way to do this and I always find it very handy while working on a multi-sheet workbook?
Open your workbook, sheet1.
Go to Window tab,
Click on New Window,
Select sheet 2 on this newly opened workbook where you will see on the top with the name: 2.
Again repeat the same steps and open sheet 3. Here with the name, you will see: 3.
Now, that you have the same workbook opened thrice with different sheets,
Go to window,
Click arrange,
Select Vertical
and here you go, three sheet of same workbook opened side by side, toggle around and enjoy working on multi-sheet workbook.