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Urgent help needed for maths step-stair help!!!!!!!!!!!!!!!!

Hi, I’m currently doing GCSE Maths and I need help on my maths coursework, it is to do with step-squares and grid sizes.... if this sounds like anything you have come across please add to this thread or PM me. I am really stuck so any help would be very useful.

P.S. This coursework I’m doing is similar to the T-totals coursework but it is to do with a step-square

31
21 22
11 12 13

THIS IS THE FIRST STEP-SQUARE WE HAVE TO WORK WITH, WE START OFF WITH A 10x10 GRID AND THEN WE WORK ON DIFFERENT STEP-STAIR SIZES AND GRID SIZES.

P.S IF YOU COULD HELP ME I WOULD REALLY APPRECIATE IT thx

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