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jz4analytics
GMAT 2: 710 Q44 V42
Posts: 284
22 Jul 2015, 14:50
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There are 25 primes less than 100. I've had some trouble remembering certain ones and decided to create a mnemonic to do so.
You can "sing" a five-note melody along with the lines, if it helps you remember:
Two, three, five, and SEVEN
Then will be ELEVEN
ThrEE, FOUR, six, and SEVEN
BE-FORE one is HEAVEN
ThrEE, FOUR, six, one, nine...
BE-FORE seven this time
Three after all the ACTORS
Except when a FACTOR
Nine after the SAME
Except for four, LAME
Corresponding numbers:
2, 3, 5, 7, 11
31, 41, 61, 71
17, 37, 47, 67, 97
13, 23, 43, 53, 73, 83
19, 29, 59, 79, 89
I know its silly, but every once in awhile I have to ask myself, "Is 43 prime?" Now I'll remember, "Three after all the actors, except when a factor" and know that yes, 43 is prime, because it ends in a 3 but does NOT start with a factor (3, 6, or 9).
You can "sing" a five-note melody along with the lines, if it helps you remember:
Two, three, five, and SEVEN
Then will be ELEVEN
ThrEE, FOUR, six, and SEVEN
BE-FORE one is HEAVEN
ThrEE, FOUR, six, one, nine...
BE-FORE seven this time
Three after all the ACTORS
Except when a FACTOR
Nine after the SAME
Except for four, LAME
Corresponding numbers:
2, 3, 5, 7, 11
31, 41, 61, 71
17, 37, 47, 67, 97
13, 23, 43, 53, 73, 83
19, 29, 59, 79, 89
I know its silly, but every once in awhile I have to ask myself, "Is 43 prime?" Now I'll remember, "Three after all the actors, except when a factor" and know that yes, 43 is prime, because it ends in a 3 but does NOT start with a factor (3, 6, or 9).
23 Jul 2015, 23:29
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This is fun! I think it's really helpful to find patterns in numbers and make them stick. The better you know your way through the numbers, the more easily you can make quick decisions about which answers are reasonable or how we might manipulate numbers to get to our destination.
02 Nov 2025, 20:47
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This is a fun topic I accidentally discovered!
Bummer this was left unnoticed for all these years!
Bummer this was left unnoticed for all these years!
