Answer:
Step-by-step explanation:
First you have to organize your information:
3 Teach.= 70 children
There are 14700 children 210 times 70.
You multiply 3*210 =70*210 because if you multiple one side you have to do the other to.
This equals 630= 14700. They need 630 teachers.
They have 612 so you only have to subtract 630 -612 =18
They need 18 teachers more.
