The errors made by children in mathematics should be :

Correct option is C

Errors made by children in mathematics are a valuable source of information about their understanding of the subject. By carefully analyzing children's errors, teachers can identify common misconceptions and develop strategies to address them. In this way, errors can be used as a tool to improve teaching and learning.
Therefore, the best way to deal with errors in mathematics is to incorporate them as a part of the teaching-learning process. This can be done by:
• Identifying common errors: Teachers can keep a record of the errors that their students make and use this information to identify common misconceptions.
• Addressing misconceptions: Once teachers have identified common misconceptions, they can develop teaching strategies to address them. This may involve providing additional instruction, using manipulatives, or using technology.
• Providing opportunities for practice: Children need opportunities to practice mathematical concepts in order to solidify their understanding. Teachers can provide opportunities for practice through homework, classwork, and games.
By incorporating errors into the teaching-learning process, teachers can help children to learn from their mistakes and become more proficient in mathematics.