Maths problem solving

Today 14th of the 8th of 2019 my maths group did a problem and presented our work to the class.
The problem said:

Tukutuku panels can be made from wooden rods (kaho) with cross stitches (tuinga), often using many colours.

The kaokao is a traditional tukutuku design that symbolises the strength of a warrior.

Imagine you continued this pattern until there were 8 kaho. How many tuinga would there be? My group found that the answer was 26 crosses or tuinga.

What if there were 18 kaho? The answer is 66.  What if there were 38 kaho? The answer is 146 we found that out by our strategy.

Find a way to calculate the number of tuinga needed for any number of kaho.


And if you look at the picture above you will see the t-chart that my group made and the towers of cross stitches and we start at 3 rods on the t-chart and 6 tuinga (crosses), we did that because there is 6 crosses on the 3 rods and then added 1 rod and 4 crosses as showed in the middle design and the smaller one by having 3 rods and 6 crosses then 4 rods and 10 crosses cos 6+4=10 then so forth +1 rod= +4 crosses.

I hope that you have found this helpful and I'm sorry if you've found it hard to read.