Q&A - P5 Math

[tianzhu]

happyheart:

Q3:

Kassim had 3 times as many stamps as Peiling. Leonard had 82 stamps more than Peiling. Kassim then sold 106 of his stamps and Leonard bought another 50 stamps. Kassim and Leonard had an equal number of stamps in the end.

a) How many more stamps did Kassim have than Peiling in the end?
Ans:132

b) How many stamps did the three of them have altogether in the end?
Ans: 621

In MD, I always have problem determining where to place the give away number and the additional bought. Appreciate your help pls.

Hi

Due to time constraints. I’ll give some pointers instead of drawing MD.

1)Draw 3 boxes to show Kassim’s stamps.

2)Draw 1 box to show Pei Ling’s stamps

3)Draw I box + 82 to show Leonard’s stamps.

4)Move 106 from end of the third box and draw a vertical line to cut all 3 MD.

5)Add 50 to Leonard(1 box+82) to touch vertical line drawn in (4)

6) Now we can see 2 units ------ 82+50+106 ----- 238
1 unit ------ 119

In the end

Kassim ------- (3*119) – 106 ------ 251 stamps left
Pei Ling ------- 119

251 – 119 ------ 132

In the end

Kassim ------- 251
Leonard ------ 251
PL ------- 119

Total number of stamps -------- 621

Best wishes

[small]

happyheart:

Q2.

A pet farm had the same number of kittens, puppies and rabbits at first. After 35 kittens, some puppies and rabbits were sold, there were 65 animals left. There were thrice as many rabbits as puppies left. There were 26 fewer kittens left than the rabbits left. How many rabbits and puppies were sold?
Ans: 44

Pls help, thanks!

Hi happyheart,

HTH, solution for Q2

In the end
Rabbits : Puppies : Kittens
3U : 1U : 3U - 26

Given that in the end, there were 65 animals left:

7U – 26 = 65
7U = 91
1U = 13

Number of Rabbit and puppies left in the end ------ 4 Units = 52


At first
Kittens ----- (3U – 26)+35
= 39 – 26 + 35
= 48

Number of Rabbits and Puppies at first ----- 48 + 48 =96

96 – 52 = 44

44 rabbits and puppies were sold.

[happyheart]

Dear Small & Tianzhu,


Thank you very much for your help!

[small]

You are welcome, happyheart.

[Easy-going]

Hi

please help me with this question:
Painter A takes 6hrs to paint a room.
Painter A and B take 4 hrs to paint a room.
How long does B takes to paint a room?

[tianzhu]

Easy-going:

Hi

please help me with this question:
Painter A takes 6hrs to paint a room.
Painter A and B take 4 hrs to paint a room.
How long does B takes to paint a room?

Hi

A common multiple of 4 and 6 is 12.

Painter A ------ 6 h -------12 units
Painter A ------- 1h ------- 2 units

Painter A and B ------ 4h -------12 units
Painter A and B ------ 1h -------3 units

Painter B ------- 1h ------- 1 unit (3-2)

Painter B ------- 12h ------- 12 units (3-2)

Best wishes

[nanschia]

Easy-going:

Hi

please help me with this question:
Painter A takes 6hrs to paint a room.
Painter A and B take 4 hrs to paint a room.
How long does B takes to paint a room?

painter A:
6 hrs ---- 1 room
12 hrs --- 2 rooms

painters A and B:
4 hrs --- 1 room
12 hrs --- 3 rooms


so painter B:
12 hrs --- 1 room

[imacsg]

Can some help me the below question?

A number, when rounded off to the nearest hundred and nearest thousand, is 462 000. What is the biggest possible number? The answer should be 462 499 or 462 049.
Thanks

[MathIzzzFun]

imacsg:

Can some help me the below question?

A number, when rounded off to the nearest hundred and nearest thousand, is 462 000. What is the biggest possible number? The answer should be 462 499 or 462 049.
Thanks

Hi

462049 - this will round to 462000 to nearest 100 and to nearest 1000 whereas 462499 will round to 462500 to nearest 100 and 462000 to nearest 1000

cheers.

[blueymum]

Thanks Bluebelt for your detailed explanation