Working out how many blocks

In maths we had to figure out how 
many block there was in Roberts
pyramid I guested  91.This is a picture of Roberts pyramid and my workings. 
 This is Roberts pyramid.

This is my working outs.

Figure it out

Today in maths we had to figure out how many block's there were in Mrs T pyramid 430 (Mrs T 

master piece.) Here are some of my working outs 
and a picture of Mrs T pyramid.

                                       This is Mrs T's pyramid.     


Then we had to work out how many blocks you would need to create another layer on the bottom. 221.

This is my working out.