Math Prime Numbers
posted by Elena on .
Grade 7 question:
I am a twodigit 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 _________?

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

Thank You !

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

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