First, let's input "a" and "b" into the equation:
(Don't forget to put brackets around the inputted numbers to show you are inputting "a" and "b")
4 ÷ a × b = 4 ÷ (444) x (213)
Now we can solve!
= 1.918
= ~ 2
Hope this helps!
Feel free to message me if you have any questions :)