Remember to know what the variables are, when first given in a quant task! (What those a, b, c are?) - positive/negative integer/float, whole/fractional/irrational, prime/composite, even/odd.
Do not ignore some brute force tasks, as there are those which are better solved this way.
LIST THE CONDITIONS of each task first.
Leave time for reviewing answers (~ 4-5 minutes is well enough with good notes).
For age calculations, re-check formulas and find what exactly is being asked.
Distinct means do not count duplicates if they show up!!!
Area of tri = base*height/2, just don’t forget that denominator!
Multiplying both the denominator and nominator gives you the same fraction!
A probability of any event (or of all scenarios added) cannot be higher than 1! Check for that.
If there are % of people who are ____, # of people * that % MUST BE an integer (no fractional humans, living things, sold torches, dough).
Ex: 26 and 76 have the same unit digits. Spacing 5 is convenient. Plus: check your answer with a calculator to be sure for questions asking to fill out the digits in by-hand (or written) operations.
AFTER ALL, CHECK IF YOUR ANSWER FITS THE CONDITIONS!!!
When asked about “product of digits equals x”, start from PF, then find all combos of digits that satisfy the condition.
If asked about the sum of digits, consider all the possible digit combos, find how many are OK.
In QC, make sure that you are comparing the thing with the other thing, please!
When doing calculations for ratios of sum of factorials, do not forget +1 for no-coef (coef of 1, khem!) factorial terms: like, 100!+98! = 990098!+98! = 990198! —— Super important!
a : 1/b = a*b.
A VARIABLE CAN BE 0 or any real number, UNLESS OTHERWISE SPECIFIED!
Number of distinct prime factors of n and n^2 are equal.