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| ===Notes for teachers=== | | ===Notes for teachers=== |
| | | |
− | ===Activity No 1 === | + | ===Activity No 1 Activity on square and square roots by exploring the relationship between area of a square and its side length === |
| {| style="height:10px; float:right; align:center;" | | {| style="height:10px; float:right; align:center;" |
| |<div style="width:150px;border:none; border-radius:10px;box-shadow: 5px 5px 5px #888888; background:#f5f5f5; vertical-align:top; text-align:center; padding:5px;"> | | |<div style="width:150px;border:none; border-radius:10px;box-shadow: 5px 5px 5px #888888; background:#f5f5f5; vertical-align:top; text-align:center; padding:5px;"> |
| ''[http://www.karnatakaeducation.org.in/?q=node/305 Click to Comment]''</div> | | ''[http://www.karnatakaeducation.org.in/?q=node/305 Click to Comment]''</div> |
| |} | | |} |
− | *Materials/ Resources needed :- | + | *Estimated Time : |
− | *Prerequisites/Instructions, | + | 40 minutes. |
− | *Multimedia resources | + | *Materials/ Resources needed :Laptop, geogebra file, projector and a pointer. |
| + | *Prerequisites/Instructions: |
| + | # The students should know tables and multiplication . |
| + | # They should know that the product obtained by multiplying the same number twice is called a perfect square number and the number itself is called its square root. |
| + | # They should know a square , its side length and finding area of a square. |
| + | *Multimedia resources : Laptop |
| *Website interactives/ links/ simulations | | *Website interactives/ links/ simulations |
− | *Process/ Developmental Questions<br> | + | *Process: |
− | *Evaluation <br> | + | # Initially the teacher can discuss about a square, its sides and area of a square. |
− | *Question Corner | + | # Tell the students that each small inner square measures 1 unit . |
| + | # Formula to find area of square is side X side. |
| + | # Each inner square's area is 1 sq unit. |
| + | # Start with a outer big square of side length 3, which gives an area of 9. Then after doing side lengths of 3-5, put up a square and say the area is 64, so what must the side lengths be? The students will know it must be 8. Do this a few times and then introduce the new notation saying that the side length for the square with area 64 is the sqrt(64) = 8, and that is along the side of the square. Similarly repeat for area 144 and write it as square root of 144 =12 on the side length. Tell them that a square root is the inverse of squaring a number. |
| + | # Introduce the symbols forsquare and square root. |
| + | Extending the analogy to the area of a square and its side length helps students visualize the geometric meanings of square and square roots. |
| + | [Note : Disadvantage of this activity: here we can consider only positive numbers as square roots. Hence in further classes the concept of square root should be extended to negative numbers as well.] |
| + | *Developmental Questions: |
| + | # What is the figure called ? |
| + | # How do you know its a square ? |
| + | # Why is the figure called a perfect square ? |
| + | # What are the dimensions of each inner smaller square ? |
| + | # What is the area of each small inner square ? |
| + | # What is the area of two such small squares ? |
| + | # What is the area of 9 such small squares ? |
| + | # If the small squares are of 1 unit dimension, and area of each such square is one sqcm, can we say that the whole area is equal to the total number of smaller squares. |
| + | # (The number of cells/small squares in each row) x (number of rows) gives us ________. |
| + | # If the number of cells in each row and number of rows is same then we multiply the _________ number twice. |
| + | # Conversely if area is known, then its ___________ can be found out. |
| + | # For ex : If the area of a square is 81, then what would be its side length? |
| + | |
| + | *Evaluation : |
| + | # Did students make the connection between the area of a square and square numbers? How do you know? |
| + | # What evidence helped you assess students' understanding of the geometric meaning of square root? |
| + | *Question Corner: |
| + | # If you know the side length of a square, how can you determine its area? |
| + | # If you know the area of a square, how can you determine its side length? |
| + | |
| ===Activity No 2 === | | ===Activity No 2 === |
| {| style="height:10px; float:right; align:center;" | | {| style="height:10px; float:right; align:center;" |