It  is my experience that the fundamental numeracy skills are not being emphasised in the schooling  system. Learners are progressing through the system with no "feel" for numbers, with a huge emphasis being placed on the fact that a calculator can work it out for you!! This misses the  entire  point of the numeracy skill and leads, in my view, to a downgrading of the "fun" of mental  arithmetic. Without this skill, there exists no "feel" for  want of a better word, or I suppose "instinct" would also suffice, and incorrect  answers are given regularly "because that  is  the answer the calculator got".
 
So, tremble little children when I take over the whole  education system, because you will be  forced to learn your multiplication tables, how  to add and subtract and horror of horrors- the long division. And your  progress through the system will be dependent on your ability to get at least 50% of the answers right- unlike  the current system where one  in three correct is  quite enough to get you through.