N people visit their friends staying N kilometres along the coast.
Some walk along the cliff path at N km an hour, the rest go by car.
How long is the road?
All in a Jumble
Age 11 to 14 Challenge Level:
My measurements have got all jumbled up!
Drag the entries in
the table up and down until all the measurements match up sensibly.
For some items there are a few numbers which would be valid. You
have to juggle them to find a combination where every measurement
This page will be different every time you load it or refresh it -
so if you have unscrambled one set of measurements, you can try a
new set. See if you can do it with fewer uses of the 'score'
Small version for getting used to
Score - each item gets a maximum of three marks:
correct type of unit
within 20% of our estimate
within 1% of our estimate
On the large version, a good strategy is to drag finished items to
the top of the list, so they won't get mixed around by your later
work. If there are a few similar numerical values in your list, you
might need to swap pairs over to get the last few marks.
Large version for a real
The following sets of cards are available if you want students to
work away from the computer. They will of course lose the facility
to check their results online. Card sort 1 Card sort 2 Card sort 3
Alternatively, you could right click over a table and select the
option to print.
The NRICH Project aims to enrich the mathematical experiences of all learners. To support this aim, members of the
NRICH team work in a wide range of capacities, including providing professional development for teachers wishing to
embed rich mathematical tasks into everyday classroom practice.