Number Grid.

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Number Grid.

Using the following rule: find the product of the top left and bottom right number in a square. Do the same thing with the bottom left and top right. Calculate the difference.

Investigate.

To start this investigation I used a number grid from which I could take a box out and use to find the differences.
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2

3

4

5

6

7

8

9

0

1

2

3

4

5

6

7

8

9

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

50

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