Well it really depends if you have dyslexia or something but lots of people in my school have spelling issues and they're in 5th grade.
20 percent !
20 percent !
Twenty percent
Paediatrician is the British spelling. Pediatrician is the US spelling.
about 33%
99.9%
There are no scientific studies for this
i think only about 25%
No, Jamaican children often do better in the US because our educational syllabus is very combust.
Children
The spelling "customisation" is used in the UK, but in the US it is customization.
That is the correct US spelling of "fertilize" (to add nutrients to soil).