GRE MATH TIPS
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| divisible by 2 | if last digit divisible by 2
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| divisible by 3 | if its digits add up to a multiple of 3
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| divisible by 4 | if last 2 digits are multiple of 4
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| divisible by 5 | last digit 5 or 0
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| divisible by 6 | if divisible by both 2 and 3
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| divisible by 9 | if digits add up to multiple of 9
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| GCF | break down to prime factors and what they have in common multiply together. EX 36 and 48, (2)(2)(3)(3) and (2)(2)(2)(3)(3) so (2)(2)(3)=12
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| Prime Factors Method 1 | work way up through primes. 210=2(105)=(2)(3)(35)=(2)(3)(5)(7)
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| Least Common Multiple | smaller number that is multiple of both. 1) Determine prime factor 2) write out each prime number max number appears 3) multiply together to get LCM. EX) 6 & 8 6=(2)(3) 8=(2)(2)(2) so LCM is (2)(2)(2)(3)=24
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| Multiplying numbers with same base | add exponents
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| Divide 2 power with same base | Keep base and subtract exponents
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| Raise power to another power | multiply exponents (3^2)^4=3^8
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| Different bases same exponents | multiply bases raise to exponent
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| negative exponents | 1/#^exponent
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| number to 0 power | equals 1
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| fraction to a power | gives smaller number
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| 10 raised to an exponent | exponent dignifies number of 0s
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| Positive Number Square Roots | have both a positive and negative answer
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| Addition and Subtraction of Radicals | only like radicals can be added or subtracted
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| Multiply and Divide Radicals | multiply or divide outside and then inside radicals
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| multiplying fractions | multiply nominators and then denominators
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| Dividing fractions | multiply by reciprocal of fraction after division sign
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| simple interest | keep taking % of original
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| compound | add for each year
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| hours per unit of work | 1/a+1/b=1/T reciprocal of 1/T is answer
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| combining averages | sum of terms/number of terms = x(a)+y(b)/(x+y)
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| combination formula | n!/k!(n-k)! where n is number of items in group and k is number of items in each subgroup and ! means factorial (ex 5! = (5)(4)(3)(2)(1))
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| arc length | n/360 * 2pir
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| area of sector | n/360*pir^2
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| lateral surface area of cylinder | 2pirh
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| Total surface area of cylinder | 2pir^2+2pirh
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Created by:
jlahr
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