Math general tips Flashcards
1
Q
When to estimate
A
(a) when the problem asks for an approximate answer or (b) when answers are far apart or (c) when there are divided answers - i.e. half of them are negative and half are positive
2
Q
What are the easiest fractions?
A
the half, the quarters (1/4, 3/4), and the thirds (1/3, 2/3)
3
Q
if you have to estimate (10/22) * (5/18), how do you choose easy fractions for both? How do you knwo whether to roudn up or down?
A
(1/2) * (1/4). Rounded the first one down, and second one up. Try to make them cancel out
4
Q
DS: test cases when you see abs(x)
A
+ and -
5
Q
DS: test cases when you see x^2
A
0,1, and fracitons
6
Q
Why do we avoid 0 or 1 when testing smart numbers?
A
odds of two answers working increase
