Page 22 - NUMINO Challenge_A2

Problem solving

1 Find all the lengths that cannot be measured with Key Points
the following ruler.
Think about the
1 cm 4 cm 2 cm 3 cm lengths that can be
measured with
different lengths of
the ruler.

Lengths that can
be measured with
one length of the
ruler: 1 cm, 2 cm,
3 cm, 4 cm

2 Out of all the lengths from 1 to 8 cm, only 2 and Find out if there are
6 cm cannot be measured with the ruler. any lengths that
cannot be measured.
3 cm 4 cm 1 cm
19Measurement
One more length was marked on the ruler such
that all lengths from 1 to 8 cm can be measured.
Which of the following rulers is not marked
correctly?

1 cm 2 cm 4 cm 1 cm

2 cm 1 cm 4 cm 1 cm

3 cm 1 cm 3 cm 1 cm

3 cm 3 cm 1 cm 1 cm