Of course, now any schoolchild can easily solve problems with the help of calculators, which are very many on the Internet. Including there is an online integer calculator – https://www.calculator.io/integer-calculator/ . Well, I would not advise the student to use it quite often, after all, examples in school are given for brain development, and if the child will constantly use a calculator, then from solving problems, he will not get any benefit. I believe that you should only allow a child to use such tools if he or she is experiencing great difficulties and needs real help.