When doing math in Year 9, using BIDMAS/BODMAS can sometimes lead to mistakes that make solving problems harder. Knowing about these common errors can help you get your calculations right.

1. Forgetting the Order of Operations:
   A lot of students just do math from left to right without following the rules of order. For example, in the math problem $3 + 4 \times 2$, some people might wrongly solve it like this: $7 \times 2 = 14$. But the correct way is to do $4 \times 2 = 8$ first, and then $3 + 8 = 11$.

2. Ignoring Parentheses:
   Sometimes, students forget to solve what's inside parentheses first. For example, in the problem $2 \times (3 + 5)^2$, if they ignore the parentheses, they can easily end up with the wrong answer.

3. Mixing Up Division and Multiplication:
   Some students get confused between division and multiplication. Studies show that about 30% of students make this mistake on tests.

4. Getting Exponents Wrong:
   Another mistake is miscalculating problems with exponents. This happens a lot, especially when they are mixed with other operations. For example, in $2 + 3^2$, the right answer is $2 + 9 = 11$, but many people incorrectly think it means $5^2 = 25$.

By knowing these mistakes and how to avoid them, students can get better at using the order of operations in math.