In fact the working majority threshold is 323 seats due to the fact that the 4 Sinn Fein MPs do not take their seats in the House of Commons and as such do not vote. (marriott-stats.com)
This might have brought the Democrats in the House of Representatives below the two thirds super majority threshold on some votes. (politics.stackexchange.com)
492 delegates and six conference officials were able to agree to the resolutions in the report of the conference either by consensus or via 75 percent majority threshold. (ghanapoliticsonline.com)