It will be over pretty soon.
It was a struggle for both of my kids... partly because every time they did it, the teacher would have different rules for how they should do it. It seemed like my kids always had the wrong answers (per the teacher's requirements), but I could see how they got it, and it seemed like a reasonable way to estimate (eg, the way I would do it in real life). If it is any consolidation, my daughter who is a senior in high school is taking AB Calculus BC this year, and planning to major in Physics in spite of her struggles with estimating so many years ago.
