Thursday 23 October 2014

Number Mazes ***


Start in the yellow square and move to the orange square by adding up the numbers along the way.  You need the correct total before reaching the end.  The orange square shows you what total you need to make.  You are only allowed to visit each square once and you can only move vertically and horizontally.


1
2
5
2
7
7
2
1
7
13



4
9
6
1
9
8
7
4
8
38


10
6
5
5
1
0
3
2
6
7
10
5
34


Who is in the middle? Solution



Isobel is in the middle.

Taking the sentences in order:
Sarah is shorter than Isobel.
Sarah is shorter than Emily, who is shorter than Isobel. 
Finally Sarah is shorter than Emily, who is shorter than Isobel, who is shorter then Alice, who is shorter than Rachel.

Thursday 16 October 2014

Who is in the middle? ****



Isobel is taller than Sarah.  Emily is shorter than Isobel, but taller than Sarah.  Alice is shorter than Rachel, but taller than both Emily and Isobel.  Whose height is the middle for the group?

Thursday 9 October 2014

Wipeout * to ***

Purpose:
To use place value and subtraction.

Game Objective:
To remove one digit from the display without changing any of the other digits.

Instructions:
  • One person gives the number which all players enter into their calculators.  The same person says which digit is to be removed.
  • Good numbers are those that have a pattern, so people can tell easily if any digit but the selected one has changed.

Example:
In the display 876543, wipe out 7 without changing any other digit.  This is done by subtracting one number on the display.  So key in “-“ then the number to be subtracted and press =.  Does the display read 806543?  Players can take turns giving numbers to each other and selecting the digit to be wiped out.

Variation:
For beginners, limit the display to three digits.
For more advance mathematicians, put decimals into the display. Eg. Wipe out the 8 in 0.567891

Magic Squares Solution


Magic Square 15:

 2

7


9

 5


4

 3

Magic Square 34:

7

 4

9

 14

5

11

2

16

 10

6

15

 3

 12

13

8

1
 
Magic Square 111:

24

18

32

 3

 11

23

2

25

4

27

22

31

34

9

1

10

 36

21

6

26

30

28

5

16

 33

14

29

8

20

 7

12

19

15

35

17

13
Magic square 12:


 2

7


 4


1

 6

 5