So my child's dad was paying maintenance weekly which was fine as it covered the 52 weeks in a year. He then changed it to monthly but still gave me the same amount every 4 weeks so that works out he's paying 4 weeks money 12 times a year which works out to be 48 weeks paid so he isn't paying 4 weeks out of the year . If he calculated the proper amount it should work out to be monthly I.e 5 weeks months etc then this wouldn't be the case. Shall I bring it up or leave it?. I'm wondering if he realises this or genuinely doesn't. What would you do?