Page 58 - NUMINO TG_2A
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Challenge Car Race 03Animal Race Unit
jOb ective Compare lengths bent into right angles.
Challenge Car Race 1. Textbook Instructions
1 There are 3 race tracks. Compare the lengths of the 3 tracks. The challenge activity can be skipped at the
teacher’s discretion. Teachers may take into
Which track is the longest? Which track is the shortest? consideration the various situations that can
arise and go straight to Unit 04.
Explain why. All 3 tracks are
Track A the same length. Have students compare 3 lengths using the
If all the skills learned in the previous activities. There
horizontal and are many ways to do this, so guide them
vertical lines are through the activity.
moved, all tracks
will form the Let’s compare the length of tracks A, B,
same-sized and C. Which track is the longest? They are
rectangle. all the same.
Why?
Track B A1: If you use the side of a square as a unit
length, all the tracks are 18 units long.
A2: If you move all the horizontal and vertical
lines to the outside, all the tracks will form
the same-sized rectangle.
Track C
3. Animal Race 27
2. Build Understanding
Which track has a length that is different from the other three?
Solution: If you push the lines to the outside to make a perfect square, you can see
square “a” has 2 square sides left ever. Therefore, square “a”
has the longest length.
Answer: a
2A Unit 03 041
jOb ective Compare lengths bent into right angles.
Challenge Car Race 1. Textbook Instructions
1 There are 3 race tracks. Compare the lengths of the 3 tracks. The challenge activity can be skipped at the
teacher’s discretion. Teachers may take into
Which track is the longest? Which track is the shortest? consideration the various situations that can
arise and go straight to Unit 04.
Explain why. All 3 tracks are
Track A the same length. Have students compare 3 lengths using the
If all the skills learned in the previous activities. There
horizontal and are many ways to do this, so guide them
vertical lines are through the activity.
moved, all tracks
will form the Let’s compare the length of tracks A, B,
same-sized and C. Which track is the longest? They are
rectangle. all the same.
Why?
Track B A1: If you use the side of a square as a unit
length, all the tracks are 18 units long.
A2: If you move all the horizontal and vertical
lines to the outside, all the tracks will form
the same-sized rectangle.
Track C
3. Animal Race 27
2. Build Understanding
Which track has a length that is different from the other three?
Solution: If you push the lines to the outside to make a perfect square, you can see
square “a” has 2 square sides left ever. Therefore, square “a”
has the longest length.
Answer: a
2A Unit 03 041