Respuesta :

sportykake
Those added together should be 607, so the sum would be 600+7. Hope that helped!

Answer: The sum of the tens is 10 tens not 1 ten

Step-by-step explanation:

500+10+7=517

then you keep adding 10 until you get 607. Why 607?? Because 260+347+607. Once your done adding count all your tens you will see theres only 10 tens .Your welcome.