CBSE Class 2 Mathematics NCERT Solutions: Chapter 13 - The Longest Step

To find out whose step is the longest, follow these steps:

1. Gather 3-4 friends in an open space where you can walk a few steps.
2. Each friend should take one normal step forward.
3. You can mark the starting point and the point where each person's foot lands after one step.
4. Alternatively, you can draw lines on the floor representing the length of each person's step.
5. Compare the lengths of the lines or the distance covered by each step. The longest line or the furthest distance covered by a step belongs to the person with the longest step.

This activity helps in comparing lengths using a non-standard unit (steps) and understanding relative sizes.

This question involves measuring distances in your classroom using non-standard units. Here's how you can approach it:

(a) Distance between the door and any window of your class:

1. Choose a window in your classroom.
2. Stand at the door and take steps towards the chosen window.
3. Count the number of steps it takes to reach the window.
4. You can also use your handspans or feet to measure this distance and count how many handspans or feet fit between the door and the window.
5. Record your measurement (e.g., 'It is 10 steps from the door to the window').

(b) Distance between the blackboard and where you are sitting:

1. Stand at the blackboard.
2. Walk towards your seat, taking normal steps.
3. Count the number of steps you take to reach your seat.
4. You can also measure this distance using handspans or feet and count them.
5. Record your measurement (e.g., 'It is 5 steps from the blackboard to my seat').

Remember, the number of steps, handspans, or feet will be different for each person, as these are non-standard units.

Yes, Rajat can use a handspan to find the length of many things. A handspan is a non-standard unit of measurement, which is the distance from the tip of the thumb to the tip of the little finger when the fingers are stretched out wide.

While a handspan is useful for measuring shorter objects or distances, it might be less practical for very long things. However, for many common objects found in a classroom or home, a handspan can provide a reasonable estimate of their length or height.

This is an activity to observe and measure objects using your handspan. Things that are shorter than your handspan are typically small items. Here are some examples of things you might find around you that are less than your handspan:

• An eraser
• A pencil (part of it, or a short pencil)
• A sharpener
• A chalk stick
• A matchstick
• A coin
• A button
• A key

You should try to measure these items with your handspan to confirm they are indeed shorter.

For things that are very small and shorter than your handspan, like an eraser, a sharpener, or a matchstick, you would need a more precise measuring tool. Common tools used for finding the length of such small items include:

• A ruler (or scale): This is a straight edge with markings in standard units like centimetres (cm) and millimetres (mm). It is ideal for measuring small objects accurately.
• A measuring tape: While often used for longer items, a flexible measuring tape can also be used for smaller, curved, or irregular objects.

Using a ruler or a measuring tape allows for more accurate measurements compared to non-standard units like handspans or fingers for very small objects.

This question refers to an activity where students likely built mud houses and then compared their heights. To answer this, you would need to know the heights of the mud houses made by different students.

• Who made the highest mud house? To find this, compare the heights of all the mud houses. The student whose mud house is the tallest made the highest mud house.
• Whose mud house is the smallest? Similarly, compare the heights of all the mud houses. The student whose mud house is the shortest made the smallest mud house.

This exercise helps in understanding the concepts of 'highest' and 'smallest' by comparing heights, likely measured using non-standard units like handspans or fingers.

Observing the image, the smaller coconut tree appears to be roughly half the height of the bigger coconut tree.

Given that the bigger tree is 6 metres high, we can estimate the height of the smaller tree.

If the smaller tree is about half the height of the bigger tree, then its height would be approximately:

Height of smaller tree ≈ $\backslash frac\{1\}\{2\}$ × Height of bigger tree

Height of smaller tree ≈ $\backslash frac\{1\}\{2\}$ × 6 metres

Height of smaller tree ≈ 3 metres

Answer: The smaller tree is about 3 metres high.

This is a practical activity designed to help you practice estimating and measuring lengths using different non-standard units. You need to fill in the table based on your own guesses and measurements.

Here's how to complete the table:

1. Look at each thing shown in the pictures (Glass, Bucket, Your hand, Teacher's table, Your nose, Water bottle, Your hair).
2. Guess the length or height: Before measuring, guess how long or high each item is. Write your guess in the 'My guess' column using the suggested unit (fingers, handspans, matchsticks).
3. Measure and check: Now, use the suggested unit to measure the actual length or height of each thing. For example, use your fingers to measure the height of a glass, or use handspans to measure the length of a table.
4. Record the result: Write your actual measurement in the 'My result' column.

Example for 'Glass':

• My guess (in fingers): 5 fingers
• My result (in fingers): 6 fingers

Example for 'Bucket':

• My guess (in handspans): 4 handspans
• My result (in handspans): 5 handspans

Example for 'Teacher's table':

• My guess (in handspans): 8 handspans
• My result (in handspans): 9 handspans

Example for 'Your nose':

• My guess (in fingers): 1 finger
• My result (in fingers): 1 finger

Example for 'Water bottle':

• My guess (in fingers): 10 fingers
• My result (in fingers): 12 fingers

Example for 'Your hair':

• My guess (in handspans): 2 handspans
• My result (in handspans): 3 handspans

This activity helps you understand the difference between guessing and actual measurement, and how different units give different numbers for the same length.