T-Totals (A*) Firstly I have chosen to look at the 9 by 9 grid. I will be taking five t-numbers in a row and investigating the t-totals for them. Once I have completed all five, I will then look for a formula to link those five

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T-totals

Introduction:

                  During this investigation I will be looking at different sized number grids, for example: (9 by 9, 10 by 10, etc…..). By looking at these different grids I will be drawing shapes on them called the t-shape. When I have drawn these, I will then be adding up the five numbers inside the t-shape. The sum of these five numbers will be called the t-total. Once I have found the t-total I will then record the number at the base of the t-shape which will be called the t-number. After recording all these figures I will then try and find whether there is a relationship between the t-number and the t-total thus coming up with a formula that links them.

Grid 1: (9 by 9)

                        Firstly I have chosen to look at the 9 by 9 grid. I will be taking five t-numbers in a row and investigating the t-totals for them. Once I have completed all five, I will then look for a formula to link those five and then I will be moving onto the second grid.

Number 1:

The t-number in this case will be 30.

The t-total is 30+21+13+12+11 which will give us 87.

T-number: 30

T-total: 87

Number 2:

The t-number in this case will be 31.

The t-total is 31+22+12+13+14 which will

give us 92.

T-number: 31

T-total: 92

Number 3:

The t-number in this case will be 32.

The t-total is 32+23+15+13+14 which will

give us 97.

T-number: 32

T-total: 97

Number 4:

The t-number in this case will be 33.

The t-total is 33+24+14+15+16 which will

give us 102.

T-number: 33

T-total: 102

Number 5:

The t-number in this case will be 34.

The t-total is 34+25+15+16+17 which will

give us 107.

T-number: 34

T-total: 107

        

Formula:

             After investigating the t-numbers from 30 to 34 and comparing them with their t-totals, I have noticed that every time I increase the t-number by one the t-total goes up by five. I found this out by doing the table seen below:

This table shows us that 5 multiplied by the nth term added to 82 will give us the t-total.

Overall formula:

        I have also figured out a formula that will give us the t-total of any chosen t-number at random on a 9 by 9 grid. I did this by calling the t-number the nth term in each case and working out a formula from there, what I have done can be seen looking at the table below:

*nth term

Formula: 5n-63.

Checking:

               I will now be checking if the formula I have come up with was correct, I will do this by choosing a random number on the 9 by 9 grid and substituting the t-number into the equation and coming up with the t-total without adding up the rest of the numbers. I will then add up the t-total and if it matches my prediction my formula will be correct.

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The random number I have chosen is 69; this will be the t-number for checking my formula. I am now going to substitute the number into the equation:

T-total = 5(69)-63

T-total = 282

Now that I have got my prediction I will do what I have done for all the other numbers and find it out manually.

Predicted number:

The t-number in this case will be 69.

The t-total is 69+60+51+50+52 which will

give us 282.

T-number: 69

T-total: 282

My formula has turned out to be correct, I will keep this information and move ...

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