I am less than 25. My ones digit is twice my tens digit. My digits add up to an even number.
Even and Odd
Stage: 1 Challenge Level:
If you don't have any interlocking cubes, you could shade squares
on squared paper in the same way as the pictures of coloured
squares. You could then cut out your 'blocks' of
squares and choose two to fit together.
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. More information on many of our other activities
can be found here.