Q&A - P5 Math

[littleprince]

(n+1)^2 + n[/quote]
(n+1)^2 + n -- sorry dont understand...[/quote]
Fig. Number => Number of Dots
-------------- -------------------------------
1 => (1+1) X (1+1) + 1 = 5
2 => (2+1) X (2+1) + 2 = 11
3 => (3+1) X (3+1) + 3 = 19
n => (n+1) X (n+1) + n = (n+1)^2 + n[/quote]

WOW, I'm stumped! Do they actually teach the skills to the kids before expecting them to solve it?!!!

[PiggyLalala]

Fig 1 = a 2 by 2 square + 1 dot.
Fig 2 = a 3 x 3 square + 2 dots
Fig 3 = a 4 x 4 square + 3 dots
Fig 4 = a 5 x 5 square + 4 dots
...

Figure n = a (n+1) by (n+1) sq + n dots.

[alfretztay]

Hi.
Can anyone tell me the formular/rule of this question?



Thks in advance!

(n+1)^2 + n

(n+1)^2 + n -- sorry dont understand...

I hope I could help explain with my working as follows:

Fig no.---------->No. of dots

1 ----------> 1+(1+1)^2=5
2 ----------> 2+(2+1)^2=11
3 ----------> 3+(3+1)^2=19
. -----------> .
. -----------> .
. -----------> .
n -----------> n+(n+1)^2

Hence, the formula would be "n+(n+1)^2".

[tracywham]

Hi, have 2 questions that I need help.

(1) 0.55 of a box of chocolate are dark chocolate, 0.3 are milk chocolate and the rest are white chocolate. There are 138 pieces more dark chocolate than white chocolate. How many chocolates are there in the box?

(2) Every day Indar saves $1.50 and Zoe saves $1 more than Inder. Although Zoe starts to save 10 days later than Inder, she has now saved $12 more than Inder. How many days has Inder been saving? How much money has Zoe saved now?

Thank you in advance.

[Jerico]

Hi,

Can someone please help with the following question :-

Q : Samuel and Timothy went shopping with a total of $550. After Samuel spent 2/5 of his money and Timothy spent $110, the ratio of Timothy's money to Samuel's money became 5 : 3. What was the ratio of Samuel's money to Timothy's money at first ? Leave your answer in the simplest form.

Thank you in advance for your kind assistance.

[Jerico]

Hi, also need help with this question :-

Q : Mrs Rosie sold 429 cupcakes in the morning and 3/5 of the remaining cupcakes in the afternoon. She found that the number of cupcakes she had left was 1/8 of the original number of cupcakes. How many cupcakes did she have at first ?

Thanks in advance for your help !

[speedmaths.com]

Hi, have 2 questions that I need help.

(1) 0.55 of a box of chocolate are dark chocolate, 0.3 are milk chocolate and the rest are white chocolate. There are 138 pieces more dark chocolate than white chocolate. How many chocolates are there in the box?

Thank you in advance.

Hi tracywham,

Let's try:

One possible solution:

Let there be 100 Bags of chocolates in the Box.

(0.55 of a box of chocolate are dark chocolate)
Let there be 55 Bags of dark chocolate

(0.3 are milk chocolate)
Let there be 30 Bags of milk chocolate

(the rest are white chocolate)
100 - 55 - 30 = 15
Let there be 15 Bags of white chocolate


55 - 15 = 40
There are 40 Bags more of dark chocolate than white chocolate
There are 138 pieces more dark chocolate than white chocolate


40 Bags → 138

100 Bags → 138 x 100 ÷ 40 = 345


(How many chocolates are there in the box?)

Answer: 345 chocolates


Hope this helps

Cheers



speedmaths
.


PS.

This question is odd in that you get decimals for the number of dark chocolates, milk chocolates and white chocolates.

[tianzhu]

Hi, also need help with this question :-

Q : Mrs Rosie sold 429 cupcakes in the morning and 3/5 of the remaining cupcakes in the afternoon. She found that the number of cupcakes she had left was 1/8 of the original number of cupcakes. How many cupcakes did she have at first ?

Thanks in advance for your help !

Hi Jerico

Good Morning.

You may wish to take a look at a similar question as an example.

I've drawn more MD than necessary. Once students become more familiar, the lower MD may be omitted.

Hope this helps.

Best wishes

[littleprince]

[speedmaths.com]

Hi, also need help with this question :-

Q : Mrs Rosie sold 429 cupcakes in the morning and 3/5 of the remaining cupcakes in the afternoon. She found that the number of cupcakes she had left was 1/8 of the original number of cupcakes. How many cupcakes did she have at first ?

Thanks in advance for your help !

Hi Jerico,

Let's try.

One possible solution.

Let Mrs Rosie have 429 cupcakes and another 5 Bags of cupcakes at first.

Mrs Rosie sold 429 cupcakes in the morning.

She had 5 Bags of cupcakes remaining.

She sold 3/5 of the remaining cupcakes in the afternoon.
She sold 3 Bags of cupcakes in the afternoon.
She had 2 Bags of cupcakes left.


She found that the number of cupcakes she had left was 1/8 of the original number of cupcakes.

She found that the number of cupcakes she had left was 2/16 of the original number of cupcakes.

She found that the number of cupcakes she had left (2 Bags) was 2/16 of the original number of cupcakes (16 Bags).


She had 16 Bags of cupcakes at first.
She had 429 cupcakes and another 5 Bags of cupcakes at first.


16 Bags → 429 + 5 Bags
11 Bags → 429
1 Bag → 39
16 Bags → 624

She had 16 Bags of cupcakes at first.

She had 624 cupcakes at first.


Hope this helps.

Cheers



speedmaths
.