Question

Use patterns and properties to compute mentally 3,000 * 70

Answer 1

This should be simple.

So, just do 7*3.

7*3 = 21.
Then add however many 0s you see, so 4.

210,000.

Your Answer:
210,000

Answer 2

Well, 7*3= 21 so all you have to do is add the zeros to get: 210,000
:) 
Hope this helped!