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Friday, June 18, 2021

 



Coral reefs are fragile and they need to be protected. There are some natural threats to coral reefs, but people cause the most damage. Coral needs clear water to grow. When forests are cut down on land, erosion washes soil into the ocean. The plants inside the corals stop growing and the corals begin to die. Pollution caused by industry and shipping can also poison coral polyps. Ships leak fuel into the water and the boat anchors break off coral. Oil spills can cause huge damage as well.


1.  What does the phrase need to be protected suggest about the meaning of the word, fragile?


2. Use the clues in paragraph 2 to help you write a definition for the word, erosion.


3. Use the clues in paragraph 3 to help you write a definition for the word, pollution.




Many reef fish have bright colors. This provides them with good camouflage. Colorful spots and stripes make them difficult to see among the coral. Some fish can even change their color to hide from predators. Others, such as trumpetfish, are predators that change color to trick their prey.
























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PERIMETER REVISION TEST

Remember to fill in any missing sides. 












4. The side of a square is 7.5 inches. What would be the perimeter of the square?



5. What is the perimeter of the shape below?


6. Below is an equilateral triangle. All the sides are the same length. What is its perimeter?



SECTION B

For each shape below, you are given the perimeter. Find the length of the unknown side. 




d) A rectangular field has a perimeter of 54 feet. If one side of the field measures 12 feet, what is the length of the other side?

e) The distance around a square sheet of paper is 168.8m. What is the length of each side of the square?


HOMEWORK

Section A

1. What is the perimeter of the shape below?

2. Each small square in the shape below measures 2cm. 

a. Calculate its length. 
b. Calculate its width. 
c. Calculate its perimeter. 



3. The width of a rectangle is 6.2m. It is length is twice its width. 

a. Calculate its length. 
b. Calculate its perimeter. 


4. In the shape below, all the sides are equal. What is the perimeter?



Section B
 

1. Look at the shape below. All the sides are EXACTLY THE SAME LENGTH. What is the perimeter of the shape?







2. 


3-4. 

5. The length of one scarf is 45cm. What would be the length of 20 scarves? You must give your answer in metres. 


6. There are 25 CDs in a box. A shop orders 14 boxes. How many CDs did the shop order?


7. Calculate the area of the rectangle shown below.



8.


9. What is the sum of the factors of 21? _______________



10. Five scones cost $2.85 and three teas cost $1.80. What is the total cost of one scone and one tea? ___________




11. Find the missing angle in the triangle shown below.




12. Stacy has $60. What is three-fifths of her money?



13.



14. Tickets for the zoo cost $9.30 for adults and $6.40 for children. How much would it cost for 3 adults and 4 children? .....................












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