Tutor MathsGuru: Ask me for your burning Maths questions!

[wkong]

Wow, you are a good sister. My son is taking PSLE too in 2011. The source is ThinkingMath@onSponge - Conquer Problem Sums assessment book

[capricorn28]

Hi iFruit and Vanilla Cake


Thank you for your answers. Will let you know if the answers are correct after my daughter gets back with the right answers.

[Almighty]

Hi Dharma Sir,


I had posted a message to u. Pl.c 2 it when u r free.

[pineapple tarts]

Hi there,


The difference between 2 numbers is 66. When you divde the bigger number by the smaller number, the quotent is 7. What is the bigger number?

I found the answer using algebra. But how do I teach my P3 the correct way? Pls help me. thank you very much.

[iFruit]

pineapple tarts:

Hi there,


The difference between 2 numbers is 66. When you divde the bigger number by the smaller number, the quotent is 7. What is the bigger number?

I found the answer using algebra. But how do I teach my P3 the correct way? Pls help me. thank you very much.

Model diagrams may be better to start off with...

one box = smaller number
7 boxes = bigger number.

6 boxes = 66

1 box = 11; 7 boxes = 77.

[Almighty]

Dharma sir,


Pl.c for a message sent 2 yr inbox again.
Thnks

[Hifive]

Hi everyone


Need help with this P5 question:

The total of 4 numbers was 390. When the first number was tripled, the second number halved, the third number increased by 28 and the 4th number decreased by 15, the 4 numbers became equal. Find the original value of each number.

Thanks in advance.

[Vanilla Cake]

Hifive:

The total of 4 numbers was 390. When the first number was tripled, the second number halved, the third number increased by 28 and the 4th number decreased by 15, the 4 numbers became equal. Find the original value of each number.

After
1st number: u
2nd number: u
3rd number: u
4th number: u

Before
1st number: ⅓u
2nd number: 2u
3rd number: u-28
4th number: u+15

⅓u+2u+u-28+u+15=390
4⅓u-13=390
13u/3=403
u=403x3/13=93

1st number: ⅓u = 1/3x93=31
2nd number: 2u =2x93=186
3rd number: u-28 =93-28=65
4th number: u+15 =93+15=108

The original value of 1st number, 2nd number, 3rd number and 4th number is 31, 186, 65 and 108 respectively.

[pineapple tarts]

iFruit:

pineapple tarts:

Hi there,


The difference between 2 numbers is 66. When you divde the bigger number by the smaller number, the quotent is 7. What is the bigger number?

I found the answer using algebra. But how do I teach my P3 the correct way? Pls help me. thank you very much.

Model diagrams may be better to start off with...

one box = smaller number
7 boxes = bigger number.



6 boxes = 66

1 box = 11; 7 boxes = 77.

Many thanks iFruit, but i still cannot understand. :oops:

[Hifive]

Hi Vanilla Cake


Thanks for your explanation!

There is one more question:

Jenny and Lydia wanted to buy some souvenirs for their friends when they were on a holiday. They had a total amount of $625 with them. Jenny had $115 more than Lydia. At the souvenir shop, Lydia spent half of what Jenny spent. In the end, Lydia was left with 4 times as much money as Jenny. How much did Jenny spend?

Thanks again.