Grade 7 question:
I am a two-digit prime number
I am one less than a multiple of 10
If you add 30 to me you get another prime number
Who am I _________?
Math Prime Numbers - bobpursley, Monday, September 8, 2008 at 9:17pm
you can try 19, 29, 59, 79, 89. That will start you. On your own, figure out why I selected those.
Math Prime Numbers - Elena, Monday, September 8, 2008 at 9:44pm
Thank You !
Math Prime Numbers - ryan dale, Wednesday, September 24, 2008 at 8:57pm
they all end in 9 and are all multiples of a number:P ahahaah
atubrk tbif - atubrk tbif, Saturday, January 17, 2009 at 1:43am
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