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http://nrich.maths.org
If you want to build higher,dig deeper
Plymouth25th October 2013
http://nrich.maths.org
Five strands of mathematical
proficiency
NRC (2001) Adding it up: Helping children learn mathematics
http://nrich.maths.org
Dicey Operations
Find a partner and a 1-6 dice, or preferably a 0-9 dice.Each of you draw an addition grid.
Take turns to throw the dice and decide which of your cells to fill - either fill in each cell as you throw the dice or collect all your numbers and then decide where to place them.
Throw the dice nine times each until all the cells are full.Whoever has the sum closest to 1000 wins.
http://nrich.maths.org
Dicey Operations
• Adding, closest to 1000 wins
• Subtracting, closest to 400 wins
• Multiplying, closest to 1000 wins
• Multiplying, closest to 10000 wins
http://nrich.maths.org
M, M and M
2, 5, 5, 6, 7
Mean = Mode = Median = Range
Can you find other sets of five positive whole numbers that satisfy these conditions?
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NRICH problems require students to work mathematically
Exploring → Noticing Patterns
→ Conjecturing
→ Generalising
→ Explaining
→ Justifying
→ Proving
http://nrich.maths.org
Attractive Tablecloths
Charlie has been designing tablecloths for each weekday.
He likes to use as many colours as he possibly can but insists that his tablecloths have some symmetry.
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Monday’s rule
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Tuesday’s rule
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Wednesday’s rule
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Thursday Friday
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Opposite Vertices
Can you recreate squares and
rhombuses if you are only given a side?
Or a diagonal?
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When would you use these?Why would you use them?
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What’s it Worth?
Marbles in a Box
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What’s it Worth?Each symbol has a numerical value.
The total for the symbols is written at the end of each row and column.
Can you find the missing total that should go where the question mark has been put?
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Marbles in a Box
How many winning lines are there?
Try to adapt each method to work out
the number of winning lines in a
4 x 4 x 4 cube.
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Factors and Multiples Challenge
You will need a 100 square grid.
Choose a number and cross it out on the grid.
Then choose a second number to cross out.
This number must be a factor or multiple of the first number.
Continue to cross out numbers, at each stage choosing a number that is a
factor or multiple of the previous number that has been crossed out.
Try to find the longest sequence of numbers that can be crossed out.
Each number can only appear once in a sequence.
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5 = 3² − 2²
13 = 7² − 6²
19 = 10² − 9²
12 = 4² − 2²
28 = 8² − 6²
40 = 11² − 9²
45 = 7² − 2²
45 = 9² − 6²
45 = 23² − 22²
23 = 12² − 11²
24 = 7² − 5²
25 = 5² − 0²
What’s Possible?
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The ‘new’ site
http://nrich.maths.org
To summarise
Teaching through rich tasks
Targetted Home pages
Features with rich tasks and articles
Collections and Mapping Documents
Teachers’ Resources for each task
General Resources
http://nrich.maths.org
What next…
CPD Follow-up page: http://nrich.maths.org/7768
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