In Present perfect^x, Plurals^x, Idioms^x

The biggest error is that 51 will be followed by "st" instead of "th". You can tell because you would say it aloud "fifty-first". Also, "50 pages" does not need an article (a/an, or the) because it is plural, so that is correct, however, "51st...

The biggest error is that 51 will be followed by "st" instead of "th". You can tell because you would say it aloud "fifty-first". Also, "50 pages" does not need an article (a/an, or the) because it is plural, so that is correct, however, "51st...