“Home educating” DD (aged 5) in the very loosest sense of the word 
She’s bright and it’s quite easy so far but an ongoing problem is that while she’s great with adding and subtraction, she often writes the numbers back to front.
I want to help her with this. I’ve tried getting her to just practice over and over but unsurprisingly she gets bored of that very quickly.
I’m no teacher. I have no idea what I’m doing. Anyone got any ways/methods to try to help her out with this?