Using Excel 2016 with Win 10.

I have many entries to make via the number keypad. Periodically there are two numbers the same. Is there a way to reenter/repeat the same number with a single key? Ctrl-Y doesn't work & the 'repeat' command on the ribbon isn't enabled.

Cut & paste takes too much time, reentering the number is shorter. When entering several hundred numbers every keystroke savings helps!

Thanks,

Kim