Various ways.
Basic way. screenshot
http://i.imgur.com/aaLDCnZ.jpg
1. Open image, add an Alpha channel for transparency
Layer -> Transparency -> Add Alpha Channel
2. Suitable font - use a bold one
3. Note you can change the character spacing even negative to close-up.
4. Use the handles to adjust the text box if required.
next
http://i.imgur.com/JWzz6Ic.jpg
5. Put the text layer to the image size
Layer -> Layer to Image Size
6. Select the numbers,
Layer -> Transparency -> Alpha to Selection
7. Invert the selection
Select -> Invert
next
http://i.imgur.com/XD24dmn.jpg
8. Turn
off the visibilty of the numbers layer (click eyeball icon)
9. Make the base layer active (click on it in the layers dialogue)
10. Edit -> Cut to remove the selection.
Now you can kill the selection
Select -> None
Looking at the original image it has semi-transparency, any layer/image under it will show through. You can measure it with the color picker, maybe 40% - 60%, up to you. Use the slider top of the layers dialogue to adjust.
http://i.imgur.com/ml9oz8j.jpg
Save your work as a Gimp .xcf to keep the layers in case you need adjustments. Finally export as a .png to keep the transparency.
Another better way is using layer masks see.
https://www.gimp-forum.net/Thread-Cut-Ou...262#pid262