Jordan Sloan posted a fine idea on the TES during the World Cup 2014

(I found it thanks to the very welcome help of Craig Barton on his site)

here is a version of Jordon's task, intentionally not giving any original price

## Sunday, 23 November 2014

## Saturday, 22 November 2014

### takes and adders generalisations

- work on patterns in various sums
- reach a conjecture about how the patterns can be generalised
- prove this using (a) diagrams (b) algebra

which questions are these?

what do the diagrams show?

Labels:
generalising,
proof

## Wednesday, 19 November 2014

### expression pyramids

establish that the outer two bottom expressions must sum to a multiple of 8

students can be asked to form their own, similar, addition pyramid i.e. with a multiple of 'p' at the top

Labels:
expressions,
simplification

## Saturday, 8 November 2014

### mobile moments

the diagrams are sketches, the numbers on the bars show the ratios/proportions along the bars

Erich Friedman's weight puzzles are great...

place weights 1 to 5 so that this mobile balnces

place weights 1 to 5 so that this mobile balances

place weights 1 to 6 so that this balances

place weights 1 to 7 so that this balances

Erich Friedman's weight puzzles are great...

place weights 1 to 5 so that this mobile balnces

place weights 1 to 5 so that this mobile balances

place weights 1 to 6 so that this balances

place weights 1 to 7 so that this balances

Labels:
ratio sharing,
simple multiplication,
sums

## Wednesday, 5 November 2014

## Tuesday, 4 November 2014

### mobile inequalities

the idea for this task came from Ian Sugarman who now works with Melvyn Rust on NumberGym software

see also Paul Salomon's fine (logic) work on imbalancing on Lost in Recursion

Labels:
simple addition

## Saturday, 1 November 2014

### mobiles

in good mathematical fashion you say that the weights of the bars and the string are negligible compared with the hanging weights...

(moments are ignored by having the bars suspended at their mid-points)

good practice in doubling and halving to start with:

then an introduction of some algebraic expressions:

Labels:
forming expressions,
number review,
relations

## Sunday, 19 October 2014

### equations and equivalent fractions

problem number 8 of book 1 of Diophantus' Arithmetica (~ 200 CE) asks which number must be added to 100 and to 20 (the same number) so that the sums are in the ratio 3 : 1 these questions are in the same vein

Labels:
fraction equivalence,
linear equations

## Saturday, 18 October 2014

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