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United Kingdom Mathematics Trust York Teacher Meeting 7 July 2015.
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Transcript of United Kingdom Mathematics Trust York Teacher Meeting 7 July 2015.
United Kingdom Mathematics Trust
York Teacher Meeting7 July 2015
Introduction
Steve Mulligan– Chairman of the Team Maths Challenges Subtrust
and member of UKMT Council– (day job – Deputy Headteacher in Bradford and ex-
head of maths)– email [email protected]
Aims of the Session
• Brief overview of the activities of the UKMT• Opportunities to try out lots of questions from
TMC• Hopefully have something to take back and
use or develop for use in the classroom
Warm up question...
Warm up question...
Take 1000 and add 40 to it.Add another 1000. Add 30.Add another 1000.Add 20.Add another 1000.Add 10
Now write
your answer
down!
(don’t show
anyone)
Warm up question...
Take 1000 and add 40 to it. 1040Now add another 1000. 2040Now add 30. 2070Now add another 1000. 3070Now add 20. 3090Now add another 1000. 4090Now add 10 4100
UKMT Activities
Challenges
New
A problem from the Junior Kangaroo
A problem from the Junior Kangaroo
• The triangle has to equal 1• Square + Square + Circle < 27• Either 1 or 2 is carried from the units column• Circle must be 8 or 9• Square + Square = 111 – 88 = 23 or 111 – 99 = 12• Square is a single digit so must equal 6
Challenges
Challenges
Team Competitions
Outreach
Other UKMT Activities
Team Maths Challenge (TMC)
Group Circus
1
1 2
1 2
1
1 2
1
2
1
1 2
1
2
16
1 2
1
2
161/3
1 2
1
2
161/3
2 8
1 2
1
2
161/3
2 8
1/3
1 2
1
2
16
2 8
3
1/3
1 2
1
2
16
2 8
3
1
1 2
1
2
16
2 8
3
1
Back in the classroom...
• Primes• Factors• Multiples• Square numbers• Logical deduction• Problem solving• Proof• Teamwork/communication
Shuttle
• Replaced the “Head-to-head” round
Head to Head
2 7 12 9 5 42 150 999
5 15 25 19 85 30111 1999
f(n) = 2n + 1
Head to Head
2 5 10 4 7 30 0.5 200
7 28 103 19 903 3.2552 40 003
f(n) = n2 + 3
Head to Head
4 6 14 8 15 11 98 128
2 3 7 2 11 7 5 2
f(n) = largest prime factor of n
Head to Head
8 12 16 24 40 6 99 5000
2 3 4 4 2 9 6
70
f(n) = integer part of square root of n
Head to Head
6 12 16 1 3 8 11 20
3 6
3 5 65 6
Six Twelve Sixteen One Three Eight Eleven Twenty
f(n) = number of letters in the word n
7
Algebra Cards
• The aim is to work out the value represented by the question mark
Question 1
36 24
?
?=6
Question 2
42 15
?
?=1
Question 3
27 19
? ?
?=5
Question 4
30 15
?
? ?
?=3
Question 5
39 59
?
?
?=23
Question 6
40 29
? ? ? ?
?=9
Question 7
81 43
???
?
??
??
???
?
?=4
Question 8
5
?
?
?
96
?=5
Question 9
20
?
?? ?
2011
?=3
Question 10
10
??
1417
?=5
TMC Shuttle Round
TMC Shuttle Round
• Similar to loop cards• Two pairs of students; one teacher• One pair gets Q1 and Q3; other pair gets Q2
and Q4• 8 minutes per round• 6 minute bonus whistle
8 576
24 360
6 12
50 3750
48 54
156
9 2
12067
Changes to GCSE
• Greater emphasis on problem solving• Shift of “higher” material to the foundation
tier• More complex proofs (including proofs of
circle theorems)
Proof
Proof
Can you prove that the blue region and green region have the same area?
Proof
Introduce some dimensions. Let the radius of the larger circle be 2r2r
2r
Proof
Let the areas of the four regions be A, B, C and D
2r
2r
A
BC
D
Proof
“A + B + C + D” is a quarter circle
So A + B + C + D = ¼ π(2r)2
= ¼ π . 4r2
= πr2
2r
2r
A
BC
D
Proof
“A + B” and “B + C” are identical semicircles
SoA + B = ½πr2
andC + B = ½πr2
2r
2r
A
BC
D
Proof
Adding these gives:
A + 2B + C = πr2 2r
2r
A
BC
D
Proof
So we now have two equations:
A + B + C + D = πr2
andA + 2B + C = πr2
2r
2r
A
BC
D
Proof
So we now have two equations:
A + B + C + D = πr2
andA + 2B + C = πr2
We conclude that B and D must be equal
2r
2r
A
BC
D
JMC 2013 – Question 24
JMC 2013 – Question 24
Each of the overlapping regions contributes to the area of two squares
Total area of the three squares = (117 + 2(2 + 5 + 8) ) cm2
= 147 cm2
Area of one square = 147 ÷ 3 = 49 cm2
So length of each square is 7cm
IMC 2013 – Question 21
IMC 2013 – Question 21
Large square area 196 cm2 so length is 14cm
Ratio of areas of squares is 4:1, so ratio of sides of squares is 2:1
Let side of larger inner square be 2x, then side of smaller inner square is x.
Height is 2x – 1 + x = 3x – 1 = 14 and so x = 5cm
Shaded regions each have dimensions 4cm by 9cm, so total shaded area = 2 × 4 × 9 = 72 cm2
JMO 2011 – Question B1
Every digit of a given positive integer is either a 3 or a 4 with each occurring at least once. The integer is divisible by both 3 and 4.
What is the smallest such integer?
UKMT website: www.ukmt.org.uk .
Extended challenge solutions, including some extension material. All primary team maths resources available here.
Resources website: www.ukmt-resources.org.uk
All Challenge papers since 2004; TMC materials from 2010; many other resources (including this presentation!)
UKMT Website - Resources
Thanks for listening!