Question

How many blocks do you need to add to Square 6 to get 7? to Square 9 to get Square 10? to Square 19 to get Square 20? EXPLAIN

Answer 1

You need to add 2 blocks to get to the next square so in square 6 there are 11 orange blocks and you add 2 more to get to square 7

Answer 2

1) 7² - 6² = 49 - 36 = 13
 
In short, We need 13  blocks to add to square 6 to get 7

2) 10² - 9² = 100 - 81 = 19

In short, We need 19 blocks to add to square 9 to get 10

3) 20² - 19² = 400 - 361 = 39

In short, We need 39 blocks to add to square 19 to get 20

Hope this helps!