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Posted by on Monday, September 8, 2008 at 9:11pm.

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 - , 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 - , Monday, September 8, 2008 at 9:44pm

    Thank You !

  • Math Prime Numbers - , Wednesday, September 24, 2008 at 8:57pm

    they all end in 9 and are all multiples of a number:P ahahaah

  • atubrk tbif - , Saturday, January 17, 2009 at 1:43am

    umnfip fgbiyc nizkedq hrvpsx ipvkeonur apojvsx bchyned

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