Page 170 - New Medley 5 Semester 1

3. Place the two strips together side-by-side aligning at one end.

24 cm

9 cm

15 cm

Mark and cut out the extra part of the
15 cm
red strip that exceeds the yellow one.

4. Then, put this cut-out of the red strip
6 cm
with the yellow strip as shown alongside.
9 cm
Mark the extra part of the yellow strip
and cut it out.

5. Again, place the yellow cut-out and red cut-out
9 cm
together aligning at one end. Cut out the remaining
part of the red strip.
3 cm
6. Now, observe how many times you can put red strip
6 cm
along the yellow strip from end-to-end.
6 cm
Here, we see that the red strip goes twice along the
yellow one.

Observation: From the above, we observe that a strip
3 cm
of length 3 cm can measure exactly the strips of length
24 cm and 15 cm.

Conclusion: Thus, we conclude that the HCF of 24 and 15 is 3.

Perform the above activity for these pairs of numbers.

1. 12 and 20 2. 25 and 40 3. 18 and 30

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