G. Teaching decimal numbers using squares and abacuses
30. Finding the rational representation a of a given decimal fraction
b
When looking for a fraction that equals a given decimal number, the students
should work with squares or the abacus (as before).
squares
abacuses
Examples
tenth
one
▲
0.13
•
one tenth and
three hundredths
▲
0.13
eh
s
undredth
▲
▲
th
re
•
thirteen
hundredths
To the teacher:
Here too, instead of showing the students how to solve the problems, we recommend
that you encourage each student to try and find a method of his own.
For each decimal number, write a fraction or a mixed number that equals it. Use the
given drawings.
49
a.
0.40 =
b.
0.04 =
c.
1.31 =
From One Two and Three, part 15, p. 100