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Flashcards in Math Deck (16)
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1

read what the qn is asking

plz!!

2

when doing ratio questions,

write a fraction, then CROSS MULTIPLY to get equations!!!

3

distance formula

SQRT (x2-x1)^2 + (y2-y1)^2

4

when doing unit conversions with area,

convert each SIDE length, not the total area!!

5

don't skip right past Quantity A and B qns,

think not only of positive numbers, but also negative or smth!

6

don't rush through question, CHECK each part of answer!!1

PLEASE!

7

interquartile range from a set of numbers

you first divide the data set in half, then the range is the median of the larger half minus the lower half.

8

when doing coin qns

make a CHART TABLE THING

9

for simultaneous work eqn

figure out how much per HOUR per person, then add times, then use that addition (flip it) and its the total time per one job!!!

10

when doing age questions

watch what the qn be asking
- don't forget to MULTIPLY by years added in brackets

11

increasing rate qns

designate the two rates as two different variables. do final/initial ratio, and calculate percent after that

12

change in amount consumed qns

set up a rate of normal consumption, and change the rates to match equation, then solve!

life of tank= total amount/ rate consumed

13

compound interest

remember that the exponent is the amount of TIME times the times COMPOUNDED

ex. 2 percent per month, for 10 years
(1+0.02/12)^12 x 10

*** not 0.02 times 10!!!

14

ANY odd product is a multiple of

ODD PRODUCTS

15

two cars driving towards each other

When two people are driving towards each other… calculate the total distance, and the time it takes them to find the RATE OF DISTANCE SHRINKING per hour. That’s the SUM of the velocities of the two cars

ex. driving at speed 50 and 60kmph
then do 50t + 60t = distance
*** use D=RT!!!

16

when doing speed questions, be careful of units!!

please!