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• Level: GCSE
• Subject: Maths
• Word count: 1449

# T- Total. When trying to fine out the T-Total in a 6 by 6-number grid, If you take the other numbers in the T-Shape away from the T-Number you get a T-Shape like the one shown below the 6x6 grid.

Extracts from this document...

Introduction

T- Total

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Look at the T-shape drawn on the 9 by 9 number grid.

The numbers in this shape are added together to make the T-Total, which would be in this case 1+2+3+11+20=37. So the T-Totals number would be 37.

As I go on I am sure I will find a pattern which may help me find a rule.

## T-Number

2+3+4+12+21=42

21

3+4+5+13+22=47

22

4+5+6+14+23=52

23

The number at the bottom of the T-shape is called the T-number.

The T-number for this T-shape is 20.

If you take the other numbers in the T-Shape away from the T-Number you get a T-Shape like this.

 T-17 T-18 T-19 T-9 T

You will notice that the centre column of the T-Shape is going up in 9’s this is because of the table size. With the table set out like this a formula can be worked out to find any T-Total on this a 9x9 grid. This is done in the working below: -

T-total = T-19+T-18+T-17+T-9+T

= 5T-63

Now I will test this formula to see if it works for the 9x9 Grid

### For T-Total I will use the letter X

For the T-Number I will use the letter T

So X = 5T-63

T = 20

X = 5x20-63

= 100-63

= 37

Middle

T

This time the centre column of the T-Shape is going up in 6’s because of the table size. The formula for this size grid is T-Total = T-13+T-12+T-11+T-6+T= 5T-42

Now to do as I did before I will test my formula out: -

With X = T-Totals and T= T-Number

T = 35

So X= 5x35 – 42

This means X should equal 133

The numbers in the T-Shape are 22,23,24,29,35 and if you add them all together this makes 133 which shows my formula is true, but just to make sure I will test it again.

### T = 16

So X = 5x16 – 42

So X= 32

3 + 4 + 5 + 10 + 16 = 32

### This shows that my formula is correct!

I have tested the formula for two different T-Numbers and the formula works on a 6x6 grid.

The full formula for this size grid is: - X=5T-42

Below is a grid with parts of the formula in. I will use this to figure out a formula for any T-Total on any width grid.

 T-2G-1 T-2G T-2G+1 T-G T

T-total = T-2G-1

T-2G

T-2G+1

T-G

### T

X=5T-7G

If the Grid Width (= G), and the T-Number (= T), the T-Total (= X) is calculated by

X=5T-7G

Now I’m going to try the grid that I drew earlier which was G=9

The formula is X=5T-7G

Which changes to X=5T-7x9

X=5T-63, this shows that this rule has a relationship between itself and the rule for the grid.

I will now try the formula on a 7 by 7 grid.

 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49

X=5X17-49(2+3+4+10+17=36) – This is what the numbers in the T-Shape added together equals.

### X=85-49

X=36

 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

I am now going to try this formula on a 3 by 5 grid.

X=5X8-21 (1+2+3+5+8=19) – This is what the numbers in T-Shape added together equals.

### X=40-21

X=19

I am now going to try this formula on a 6 by 10 grid.

X=5X33-42 (20+21+22+27+33=123

### X=123

Now I have worked the formula out for the T-Shape in the one position, I am going to translate the T-Shape to different positions and investigate the relationships between the T-Total, the T-number and the grid size.

As you can see below the T-Shape can be set out just like the previous one I drew but the formulas are flipped over.

##### T

T+G

T+2G+1

T+2G

T+2G-1

T + (T+G) + (T+2G+1) + (T+2G) + (T+2G-1) = 5T + 7G

#### As you will see the rule is fairly similar but instead of a take-away sum it is an additional sum, I think this happens because usually when you flip something it is the opposite to what it was and when you flip the T-Shape it flips the rule.

I will now try this new formula on a 4 by 7 grid, using 10 as the T-Number.

 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28

Conclusion

>=56+10

=73

 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24

### I will now find out a formula that has been translated 90 degrees anti-clockwise

 T-1-G T-2 T-1 T T-2 + G

T

T-2

X= 5T-7=5x8-7

### So my rule is correct!

 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

I have tested this new formula for a side ways T the formula works it is: X=5T-7

###### Before I write the formula I will predict what it will be 5T+7
 T+2-G T T+1 T+2 T+2+G

T

T+1

T+2

T+2+G

T+2-G

5t+7

The formula is 5T+7 My Prediction was correct!

I have tested this new formula for a side ways T the formula works it is: 5T+7

The formula for a this way up is: X=5T-7G

 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

The formula for a this way up is: X=7G+5T

### The formula for a this way up is: X=5T+7

 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

The formula for this way up is: X=5T-7

 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

This student written piece of work is one of many that can be found in our GCSE T-Total section.

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