Using Chrome Remote Desktop the Num Lock key goes out of sync. This means if you turn the num lock OFF on your computer and you connect via Chrome Remote Desktop the num lock will be ON for your session. If you turn num lock ON on your computer, it will be OFF on your remote session.
There is a free Windows App called Num Locker that will keep your num lock enabled at all times. This is a great fix for this issue with Chrome Remote Desktop. Download it from the link below.