How to change brush size in Microsoft Paint without keypad

The shortcut to adjust brush size by one pixel in Microsoft Paint does not function on a keyboard without a numpad, is there any way to fix it? I have no numpad, and the change brush size hotkey is [Ctrl + (numpad plus/minus)] and it does NOT work with the plus or minus on the standard keyboard. This seems like such an incredibly basic feature to implement so poorly that the majority of laptop users won't be able to access it at all. The on-screen keyboard method does not work, I am not going to navigate through 3 menus and manually click a button until the brush size is big enough every time I want to change it. I need the ability to use the hotkey.