Math Prime Numbers

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 _________?

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asked by Elena
  1. you can try 19, 29, 59, 79, 89. That will start you. On your own, figure out why I selected those.

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    posted by bobpursley
  2. Thank You !

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    posted by Elena
  3. they all end in 9 and are all multiples of a number:P ahahaah

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    posted by ryan dale
  4. umnfip fgbiyc nizkedq hrvpsx ipvkeonur apojvsx bchyned

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    posted by atubrk tbif

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