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Class 4 Lessons - Week 9 - March 7 - 11

Monday, March 7, 2022



Using was/were (Warm Up)

https://en.islcollective.com/video-lessons/simple-present-singularplural





  1. A box contains 37 chocolates. How many chocolates are there in 23 of these boxes?



2-5. 

6. Sally bought two Lego sets. One cost $36.97 and the other cost $47.76. How much did she spend in total on these two Lego sets?


7. A model of calculator has 49 buttons. The manufacturer of the calculators wants to produce 3480 calculators. How many buttons will be needed?



Use BODMAS to calculate:


8. 6 + 4 ÷ 2


9. 7-3 x 2



10. Calculate half of one sixth.


11. An iPhone used to cost $500. The price has increased by 22%. How much does it cost now?


12. Tickets to a World Cup Cricket match cost $60.00 for each adult and half price for each child. How much did a family of 2 adults and 1 child pay for their tickets?


13. The area of a square plot of land is144m². What is the length of one side?


14. Jack went to sleep at 8:05 pm. His sister went to sleep 45 minutes before him. At what time did Jack’s sister go to sleep?


15. 


16. A box of sweets was shared among 8 friends. Each person received 12 sweets. If there were 7 extra sweets, how many sweets were in the box?




17. 4.3 + 8.4 + 9.5 =


18. If 3.15 ´x10 = 31.5, then 3.15 ´x100 = 


19. 


20. What is the L.C.M. of 4 and 6?


21. 



22. 


23.



24. 25% written as a fraction is _______



25. 


26. A farmer divides 1500 mangoes between two vendors in the ratio 2 : 3.  How many mangoes does each vendor get?


27. 


28. What needs to be added to 5.4 to make 9.3?


29. 50% of a number is 200. What is 1% of the same number?


30. Share $650 between 2 friends so that 1 friend gets $80 more than the other. 

 



English Section B Practice 



Electricity 

Electricity is a secondary energy source. Electricity is the flow of electrical power or charge. Electricity is both a basic part of nature and one of the most widely used forms of energy. The electricity that we use is a secondary energy source because it is produced by converting primary sources of energy such as coal, natural gas, nuclear energy, solar energy, and wind energy, into electrical power. Electricity is also referred to as an energy carrier, which means it can be converted to other forms of energy such as mechanical energy or heat. Primary energy sources are renewable or nonrenewable energy, but the electricity we use is neither renewable nor nonrenewable. 

Despite its great importance in daily life, few people probably stop to think about what life would be like without electricity. Like air and water, people tend to take electricity for granted. However, people use electricity to do many jobs every day—from lighting, heating, and cooling homes to powering televisions and computers. 

Before electricity became widely available, about 100 years ago, candles, whale oil lamps, and kerosene lamps provided light; iceboxes kept food cold; and wood-burning or coal-burning stoves provided heat. 

Scientists and inventors have worked to decipher the principles of electricity since the 1600s. Benjamin Franklin, Thomas Edison, and Nikola Tesla made notable contributions to our understanding and use of electricity. Benjamin Franklin demonstrated that lightning is electricity. Thomas Edison invented the first long-lasting incandescent light bulb. 

Before 1879, direct current (DC) electricity was used in arc lights for outdoor lighting. In the late 1800s, Nikola Tesla pioneered the generation, transmission, and use of alternating current (AC) electricity, which reduced the cost of transmitting electricity over long distances. Tesla's inventions brought electricity into homes to power indoor lighting and into factories to power industrial machines.


Answer the following questions

1. What is electricity?

2. Why is the electricity that we use, considered a secondary source of energy?

3. What is meant by the term energy carrier?

4. List TWO jobs that people use electricity to do.

5. From the passage, identify THREE things that were used to provide energy before the

invention of electricity.

6. Name THREE persons who made a significant contribution to our understanding of

electricity.

7. What does the abbreviation DC mean?  


Friday, March 11, 2022




Mathematics Revision


1.









2. 



3. How many 5-cents pieces can you get from $2.55?


4. The value of 7 in 3572 is _______


5. What amount must be added to 0.06 to make 1?


6. Ripe bananas are sold at four different rates. Which rate shown below is the cheapest? 

A 3 for 12¢ 

B 5 for 80¢ 

C 8 for 40¢

 D 10 for 30¢


7. There are 60 chairs in the lunchroom. The ratio of chairs to tables is 4:1. How many tables are there?


8. The length of each side of this shape is 4 cm. What is the perimeter of the shape?


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

10. A factory makes 4596 nails in a week. 2914 of the nails are sold. How many nails are left over?

11. What is 21.7 × 9.4?

12. What is 3/5 of 60?

13. Winston is packing eggs into egg boxes. He puts 6 eggs into each egg box. How many complete egg boxes can he fill with 106 eggs?

14. What is the next number in this sequence?
     23     35     47     59     ______

15. A scarf is 45 cm long. Jade buys 20 scarves. What is the total length of the scarves in metres?



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