Lesson Notes By Weeks and Term v3 - Primary 1

Lesson Video

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Performance objectives

• Understand what length is.
• Compare objects by their length.
• Arrange objects from shortest to longest.
• Measure things using our body parts.
• See how we use length every day.

Lesson summary

develop the idea of length; compare length of two or three objects; or der similar objects according to lengths; measure length and distance in the ir natural units; apply the length and or dering of lengths in our environment.

Lesson notes

Definition: Length refers to the measure of how long an object is from one end to the other, or the distance between two points. It answers the question, "How long is it?" or "How far is it?" Perception: Learners initially understand length through visual comparison. They identify objects as "long" or "short" by simply looking at them.

Examples: A long pencil, a short broomstick, a long road, a short path. Teacher

Note: Emphasize that length is about how much space something occupies along one dimension.

Process: To compare lengths, learners place objects side-by-side, aligning one end. The object that extends further is identified as "longer," and the object that is less extended is "shorter." Terminology: "Longer than": Used when one object has a greater length than another.

Example: A teacher's ruler is longer than a student's pencil. "Shorter than": Used when one object has a smaller length than another.

Example: A student's eraser is shorter than their pencil. "Same length as" / "As long as": Used when two objects have equal lengths.

Example: Two new chalk sticks might be the same length as each other.

Practical Steps: Place the two objects next to each other on a flat surface. Ensure one end of both objects is perfectly aligned (e.g., against a wall or a straight line drawn on the desk). Observe which object extends further. Use the appropriate comparative language ("longer than," "shorter than," "same length as").

Process: This involves arranging three or more objects from the shortest to the longest, or from the longest to the shortest. This builds upon the comparison skill. Steps for Ordering from Shortest to Longest: Gather several similar objects (e.g., different sized sticks, pencils, or strips of paper). Compare two objects at a time to identify the shortest. Place the shortest object first. From the remaining objects, identify the next shortest and place it next to the first. Continue this process until all objects are arranged in increasing order of length. Steps for Ordering from Longest to Shortest: Follow a similar process, but identify and place the longest object first, then the next longest, and so on. Nigerian Context

Example: Ordering different lengths of sugarcane stalks, cassava sticks for planting, or brooms found in the compound.

Concept: For Primary 1, measurement begins with non-standard, natural units. These are parts of the body used to estimate and quantify length or distance. This helps learners understand that measurement is about finding "how many" of a chosen unit fit into the object being measured.

Importance: These units are readily available and help learners grasp the concept of measurement before introducing abstract standard units.

However, it is crucial to highlight that these units can vary from person to person.

Natural Units: Hand Span: The distance from the tip of the thumb to the tip of the little finger when the hand is stretched wide open.

Application:* Measuring the length of a desk, a book, or a school bag.

Foot Span (or Foot Length): The length of one's foot from heel to toe.

Application:* Measuring the length of a mat, a rug, or a door.

Steps: The distance covered by one natural walking stride.

Application:* Measuring the width of the classroom, the distance from the board to the door, or the length of a corridor.

Strides: A longer step, often used for measuring greater distances. It's typically two regular steps combined, but for P1, it can be introduced as a 'big step'.

Application:* Measuring the length of the school field or playground.

Process of Measurement: Choose a suitable natural unit (e.g., hand span for a small object, steps for a larger distance). Place the unit at one end of the object/distance. Move the unit progressively along the object/distance without gaps or overlaps, counting each time the unit is placed. The final count is the length in that unit.

Example:* To measure a table with hand spans: Place the hand at one end, mark where the little finger ends, move the thumb to that mark, and repeat, counting each 'hand span'.

Real-life applications

Understanding length is fundamental to many aspects of daily life and professions in Nigeria.

Market Activities: In local markets (e.g., Balogun Market, Ariaria International Market), vendors and customers constantly apply the concept of length. For example, a fabric seller might measure Ankara material using their arm spans for quick estimates before using a tape, or a buyer might compare the lengths of different ropes for tying goods. Farmers sell tubers of yam, sometimes sorting them by length (long yams often fetch higher prices).

Home and Community: Within the home, children observe and use length concepts when choosing brooms for sweeping (a longer broom for a taller person), comparing the length of skipping ropes during play, or helping to arrange items by size (e.g., finding the longest wrapper for an adult). In the community, the distance to the farm or to a friend's house might be described in terms of 'how many steps' or 'how many poles' (a traditional unit of distance).

Construction and Craftsmanship: Builders and carpenters (e.g., in places like Ochanja Market, Onitsha, known for building materials) constantly measure lengths of planks, iron rods, and building blocks to ensure structures are correctly dimensioned. Local artisans weaving baskets or making traditional clothing also rely on accurate measurement of materials. This topic lays the groundwork for understanding the importance of precise measurement in these fields.

Teacher activity

• Hold up two clearly different sized objects, e.g., a long ruler and a short chalk stick.
• Ask learners to describe what they see (e.g., "This is big," "This is small").
• Introduce the terms "long" and "short" by pointing to the respective objects. "This ruler is long. This chalk is short."
• Bring out a variety of other objects (e.g., a long stick, a short stick, a long piece of string, a short piece of string) and ask, "Which one is long? Which one is short?"
• Emphasize that length describes how far an object stretches from end to end.

Evaluation guide

• Assessment will be ongoing through observation during activities (formative) and specific questions at the end of the lesson (summative), aligned with the provided evaluation guide.
• Observe learners during Activity 2 as they compare objects. Are they using "longer than" and "shorter than" correctly?
• Check learners' arrangements in Activity 3 for ordering objects. Are they able to sequence them accurately?
• Monitor learners' technique and counting during Activity 4 when using natural units. Are they avoiding gaps and overlaps?
• Summative Assessment (based on the evaluation guide):

Reference guide

• Pencils,Sticks,Desk,Strings,the classroom, pupils the mselves, etc.