Tutor MathsGuru: Ask me for your burning Maths questions!

[atutor2001]

mathsguru:

Hi KSP,

.....they can solve it within a reasonable amt of time, say 7 - 10 min....

Regards,
MathsGuru

Cannot lah. This is one of those \"NORMAL questions\". If want to get good results must solve in less than 5 min you know - no need to think one, see only must know how to just do one. That's why last thought my kid about 6 years ago now still can remember this type of question.

[mathsguru]

atutor2001:

Cannot lah. This is one of those \"NORMAL questions\". If want to get good results must solve in less than 5 min you know - no need to think one, see only must know how to just do one. That's why last thought my kid about 6 years ago now still can remember this type of question.

Well, since you know it so well, then my answer is inconsequential.

[Seekinghelp]

Hi Mathguru,

I would like to check with u the ques of this; A sausage roll was cut into 5 equal pieces. Shu Qin took a piece and ate 1/2 of it. What fraction of the sausage roll was not eaten? Ans: 2/5 rite? It’s a P2 assessment book. Because the ans that was given seems different from mine and I dun have much confidence in myself.

[mathsguru]

Seekinghelp:

Hi Mathguru,

I would like to check with u the ques of this; A sausage roll was cut into 5 equal pieces. Shu Qin took a piece and ate 1/2 of it. What fraction of the sausage roll was not eaten? Ans: 2/5 rite? It's a P2 assessment book. Because the ans that was given seems different from mine and I dun have much confidence in myself.

Hi Seekinghelp,

The answer should be 9/10.

Here's my working:
Each piece of sausage = 1/5
Amount Shu Qin ate = 1/2 x 1/5 = 1/10
Fraction of sausage that was not eaten = 1 - 1/10 = 9/10

Hope this helps. Let me know if you need further explanation ya...

Enjoy the rest of your weekend,
MathsGuru

[Seekinghelp]

Ty for yr explanation but I still dun get it. Is it possible u draw out the model and show me? Btw, yr ans is correct. So sry still need to ask u 1 more ques.


Tank A had 345 litres of water more than Tank B. Tank B had 500 litres of water less than Tank C. How much more water was there in Tank C than in Tank A? This ques is extracted fr 1 of the school exam ques but I duno how to explain it to my nephew, is it possible u show me with model drawing too?

[Muffins]

Seekinghelp:

Ty for yr explanation but I still dun get it. Is it possible u draw out the model and show me? Btw, yr ans is correct. So sry still need to ask u 1 more ques.


Tank A had 345 litres of water more than Tank B. Tank B had 500 litres of water less than Tank C. How much more water was there in Tank C than in Tank A? This ques is extracted fr 1 of the school exam ques but I duno how to explain it to my nephew, is it possible u show me with model drawing too?

Hi Seekinghelp, I can solve your problems for you!

If 1 sausage roll is cut into 5 equal pieces, then one piece will be 1/5 of the full sausage roll. Half of 1/5 is 1/10, so 1 - 1/10 = 9/10...

For your second question, it can be done like this. Tank A = Tank B + 345 litres. Tank C = Tank B + 500 litres (Tank B = Tank C - 500 litres). So, (Tank B + 500 litres) - (Tank B + 345 litres) = 500 litres - 345 litres = 155 litres.

Hope I helped!

[tutormum]

Seekinghelp:

Ty for yr explanation but I still dun get it. Is it possible u draw out the model and show me? Btw, yr ans is correct. So sry still need to ask u 1 more ques.


Tank A had 345 litres of water more than Tank B. Tank B had 500 litres of water less than Tank C. How much more water was there in Tank C than in Tank A? This ques is extracted fr 1 of the school exam ques but I duno how to explain it to my nephew, is it possible u show me with model drawing too?

Let's draw model for the suasage roll. First you cut the sausage into 5 pieces.
[ ] [ ] [ ] [ ] [ ]
However, when Shu Qin took 1 piece and ate 1/2, we have to cut the 5 pieces into halves to get equal pieces. So 1 piece now becomes 2.
[ ] [ ] [ ] [ ] [ ] [ ] [ ] [ ] [ ] [ ]
Out of 10 pieces, 1 is eaten. The total units is now 10 and as she ate 1, 9/10 is left.

Answer to your 2nd question:

Tank A [ ]
Tank B [ ]\"----345---\"------155--------------\"
Tank C [ \" ------------ 500-------------------\"]
500 - 345 = 155

Hope this is clear.

[mathsguru]

Seekinghelp:

Ty for yr explanation but I still dun get it. Is it possible u draw out the model and show me? Btw, yr ans is correct. So sry still need to ask u 1 more ques.


Tank A had 345 litres of water more than Tank B. Tank B had 500 litres of water less than Tank C. How much more water was there in Tank C than in Tank A? This ques is extracted fr 1 of the school exam ques but I duno how to explain it to my nephew, is it possible u show me with model drawing too?

Hi Seekinghelp,

Sorry for the delayed response. Just saw your posting...

Anyway, here's my detailed working for your 2 questions, similar to what the other 2 helpful KiasuParents member provided.

http://www.postimage.org/image.php?v=Pq1Jkbsr

http://www.postimage.org/image.php?v=Pq1JkdXA

Hope this clears your doubts!

Thanks and regards,
MathsGuru

[Seekinghelp]

Ty Muffins, Tutormum and Mathsguru for ans! Now i understand how to do it.


Next ques: The sum of two numbers is 15 but the difference is 7. Find the bigger number.

It seems like I'm the only one who keep asking ques :lol: Paisey.
I know the ans is 11 but i duno hw to guide him thru explanation.

[Muffins]

Seekinghelp:

Ty Muffins, Tutormum and Mathsguru for ans! Now i understand how to do it.


Next ques: The sum of two numbers is 15 but the difference is 7. Find the bigger number.

It seems like I'm the only one who keep asking ques :lol: Paisey.
I know the ans is 11 but i duno hw to guide him thru explanation.

Hi Seekinghelp, the problem can be solved in two ways. Both, easy to understand and explain. I'll give both of them.

The first way
15 - 7 = 8
8/2 = 4
15 - 4 = 11

The second way is longer but easier to explain...
Bigger number + smaller number = 15
Bigger number - smaller number = 7

So, bigger number + smaller number + bigger number - smaller number = 15 + 7 = 22

Which is the same as bigger number + bigger number = 22

So 1 of the bigger numbers is 22/2 = 11

Hope I helped!