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Primary 4 Mathematics ( Time, perpendicular & parallel lines ) problem sums

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This week exercises are a little different. Its a combination of short questions and problem sums on 2 topics ( Time and perpendicular & parallel lines)

End of year exams coming! Excited!

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U got to know how to write chemical equations before you can balance them, right?

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Hey folks, you are not going to get nice equations written for you to balance all the time. 😉

So before you can show your superb chemical reaction balancing skills, you got to know how to write chemical equations first. And you needs to be familiar with the chemical formulaes at the every least.

Common ions are sulfate, nitrate, ammonium, carbonate, prosphate. Kindly PM me if you are still ensure on these ions formulaes. 🙂

Classifying Chemical Reactions

Most chemical reactions can be classified as one of these six basic reaction types:

· Synthesis (combination)

· Decomposition

· Single Replacement (oxidation-reduction)

· Double Replacement (precipitation)

· Acid-Base (neutralization)

· Combustion

1. Synthesis Reaction: A + B –> AB

Sodium (s) + chlorine (g) –> sodium chloride (s)

 

2. Decomposition Reaction: AB –> A + B

sodium bicarbonate (s) –> carbon dioxide (g) + sodium carbonate (s) + water (l)

 

3. Single Replacement Reactions: AB + C –> A + CB

hydrochloric acid, HCl (aq) + magnesium (s) –> magnesium chloride (aq) + hydrogen (g)

 

4. Double Replacement Reactions: AB + CD –> AD + CB

calcium chloride (aq) + ammonium hydroxide (aq) –> calcium hydroxide (s) + ammonium chloride(aq)

 

5. Acid-Base Reactions: HA + BOH –> BA + H2O

Sulfuric Acid, H2SO4 (aq) + potassium hydroxide (aq) –> potassium sulfate (aq) + water (l)

 

6. Combustion Reactions: Fuel + O2(g) –> CO2(g) + H20(g)

Hexane, C6H14 (l) + oxygen (g) –> carbon dioxide (g) + water (g)

Adapted from : http://www.arps.org/users/hs/thompsom/honors/unit_02/Balancing_Equations_Packet.pdf

Finally, here are some practice for you. ( from your favourite, beautiful and wise tutor. 🙂

First write the products of chemical reactions and write word equations as formula equations and balance correctly.

  1. Magnesium + hydrochloric acid →

2.   Nitric acid + sodium hydroxide →

3.   Silver nitrate reacts with copper to form copper (II) nitrate and silver.

4.   Chlorine gas react with potassium iodide

5.    Sulphuric acid +  gold carbonate →

That’s all, folks.

You are dismissed. 🙂

Maths Maths Mama Mia!

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Maths Maths Mama Mia!

Actually there are plenty of resources online for Maths games, Maths notes, Maths practice papers and even Maths video lessons. Parents and tutors just have to take additional time to explore and filter. I am quite sure we can build an extensive lesson database for the children.

As I am a Mathematics tutor, there are several topics (after reading up on the internet and some books) i have identify to be the foundation poles for this subject.

They are as follows;
– Number Bonds (Children usually master addition from here)
– Number substraction
– Counting and skip-counting ( After this, the number line will be imprinted in their minds)
– Identifying even and odd numbers ( This will greatly help children to identifying trends in future mathematical questions)

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For my pre-school and primary 1 students, I teach number bonds using ice-cream sticks. I found most fun (and most tiring) working with this age group. Doing some lesson plans now and intend to build Maths group tuition for this level once I am satisfied with the preparations. 🙂

Afterwhich, i change my props to  M&M chocolates and playing cards and it yield MUCH MORE fun. I have read this method on using chocolates or sweets somewhere on the net but i cant find the source as i forgottent to bookmark the webpage.

I have also make some alterations to the original method accordingly to my teaching style.

Activity 1 – Yummy Number Bonds

Yummy!

Prepare A LOT OF M&M chocolates. Alternatively, peanuts, sweets or small marshmallows can be used. [ You do not have not use everything. Just for visual affect. How many teachers know what i am talking about? *wink*]
Tell your students a number. For instance, 5.
Count and put 5 M&Ms on the table.
Take away 2, and ask them to count how many are left. Remind your class to remember 2+3=5
Put back the 2 M&Ms. and Take away 3. Ask them to count how many are left. Remind them that 3+2=5
Put back the 3 items. Take away 1, and ask them to count how many are left. Remind your class to remember 1+4=5
Ask them what do they think 1+4=?

After that, ask students to add 2 groups of M&Ms to give 5 and any numbers.

Students after forming the number bonds get to keep the M&Ms. 🙂

Activity 2 – Flip , Add and Win

number cards

Use a deck of Uno cards or any numbers cards ( Strictly no poker cards if you ask me) and lay them on the table.
Flip 2 cards at a time. If the 2 cards adds up to ten ( or any number you have specify), they can keep the cards.
The student with the most cards win. 🙂

When the kids are very familiar with additions and substractions from 1-9, its a easy transition to the tens and twenties. 🙂

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For the rest of the topics stated above, im using the games and activities in the following blogs and websites.

http://homeschoolmath.blogspot.com/2007/09/number-rainbows-to-learn-subtraction.html
http://www.onlinemathlearning.com/addition-subtraction-games.html
http://letsplaymath.net/2008/05/06/struggling-math-student/
http://www.tut-world.com/p1_maths.htm
http://www.primaryworksheets.co.uk/

Lets raise some mathematican today! Woohoo! 🙂