The interval problem is the People's Education Edition of Grade Three. The interval problem is related to the interval d = p}+}-p of two adjacent prime numbers, where p is the nth prime number in the prime number sequence, and it is easy to prove that d, = 1, generally d)2 and d are even numbers. As long as n is an appropriate and large enough natural number, d can take any large value.

Summary of the methods of mathematics application problems in the third grade of primary school;

Interval number problem (method+example), as a very important part of primary school mathematics, has high requirements for students' reading ability and logical thinking ability, because some students can't combine the conditions given in the question to answer, and often isolate the conditions given in the question and answer the questions only for one or part of them.