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http://nrich.maths.org If you want to build higher, dig deeper Plymouth 25 th October 2013

# Http://nrich.maths.org If you want to build higher, dig deeper Plymouth 25 th October 2013

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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?

http://nrich.maths.org

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.

http://nrich.maths.org

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.

http://nrich.maths.org

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?

http://nrich.maths.org

The ‘new’ site

http://nrich.maths.org

To summarise

Features with rich tasks and articles

Collections and Mapping Documents

General Resources

http://nrich.maths.org

What next…

CPD Follow-up page: http://nrich.maths.org/7768