what is ur dumbest math test mistakes?

Calculated that there were -16.33 coins in a box

Having the good difficult reasoning for a 30min long vector exercise and mess up with the vector coordinates (you calculate the coordinate with a substraction 🥲). So I got 14/20 at this test, but locked in on the next test and got 18.7 which was the best grade in my entire promotion (around 400 students). But yh idk why but I am terrible at basic calculation, especially on a difficult exercise like here

I missed an entire question because it was right under another... idk how to really explain it

i forgot to multiply the length times base by 1/2 for a triangle!
Also I thought that 6*4=32 once (so the whole math question was messed up cuz of this)
Much more!

Missed the other side

7x9 =105

I remember once in a highschool exam there was an advanced question.
I solved it and at the end, somehow I wrote " 7 + 3 = 11"
Yeah
I REALLY laughed after seeing the results and noticing that mistake

A chemistry question about a mixture of Ethane and Pentane reacting to a certain volume of oxygen.

My answer was -1g of Ethane used

During rounding, i thought we were rounding to 100 not 10

Jk never took a math test in my life

Well I my mistake was that I need to match the answer with a word the thing is that I put K and K was not in the test the thing that B was the answer and K didn't exist in the test

I wrote in descending order nstead ot ascend8ng

Not knowing if it's synthetic or liable

Once I covered a part of my test and didn't notice and then forgot to do it