Q&A - P5 Math

[Superbugs]

MGS SA2 2011


Q26
Jerry had some beads. He can divide them equally into 2, 5 or 7 groups. What was the max. number of beads that he had if he had less than 250 beads?

Q29
The figure below has a perimeter of 36cm. It is made up of 9 identical triangles. What is the increase in the perimeter of the figure when a row of triangles is added to the base?
Regret that I do not know how to incorporate the figure here.
My solution: 36/9= 4cm
Increase triangles = 9 - 4base, 2 sides
Hence 6x4=24cm
However answer is only 12cm?

Pls help!

[tianzhu]

Superbugs:

MGS SA2 2011

Q26
Jerry had some beads. He can divide them equally into 2, 5 or 7 groups. What was the max. number of beads that he had if he had less than 250 beads?

Hi

For Q26, find the common multiple of 2, 5 and 7 closest to 250, the answer is 210.

A common method used in primary maths is “Systematic Listing”

A faster way to find the lowest multiple of 70 and multiply by 3.

Best wishes

[MathIzzzFun]

Superbugs:

MGS SA2 2011


Q26
Jerry had some beads. He can divide them equally into 2, 5 or 7 groups. What was the max. number of beads that he had if he had less than 250 beads?

Q29
The figure below has a perimeter of 36cm. It is made up of 9 identical triangles. What is the increase in the perimeter of the figure when a row of triangles is added to the base?
Regret that I do not know how to incorporate the figure here.
My solution: 36/9= 4cm
Increase triangles = 9 - 4base, 2 sides
Hence 6x4=24cm
However answer is only 12cm?

Pls help!

Hi

for q29.. if the figure is as shown, then the increase in perimeter is in red.

http://i53.tinypic.com/why5nm.jpg\">

cheers.

[Superbugs]

To MazzIzzzFun,


The figure is right! Tks so
Much for your explanation!

[Superbugs]

Aitong SA2 P2 Q9


ABCD us a rectangle. It is divided into 4 unequal triangles P, Q, R and S which meet at a point as shown (sorry I am unable to draw the figure here). Find the area of triangle S.

Assume Meet point is H, Some other information:
Triangle ABH - 24cm
Triangle ADH - 51cm2
Triangle CHD - 45cm2
Both ABH and CHD shares the same base (breadth of rectangle)

Kindly assist. Tks

[Superbugs]

Aitong P2 Q17

The ratio of Steven’s cards to Benny’s cards was 3:4. After Steven bought another 9 cards and Benny lost 18 cards, the ratio became 3:2. Find the total number of cards Steven and Benny had at first?

Pls help. Tks

[Essential]

Superbugs:

Aitong P2 Q17

The ratio of Steven's cards to Benny's cards was 3:4. After Steven bought another 9 cards and Benny lost 18 cards, the ratio became 3:2. Find the total number of cards Steven and Benny had at first?

Pls help. Tks

Hi superbug, Mathizzfun already replied to my post, It the same question.

[Superbugs]

Yes got it from earlier trails. Tks a lot!

[Essential]

Hi, anyone can help. Ai tong paper 2 question 2).

I am thinking of 2 numbers, A and B. 1/3 of A has the same value as 5/6 of B. If their difference is 36 , what is their sum?

Question 15) 608 Children took park in a skipping competition. Altogether 110 glod awards were presented to 1/5 of the boys and 1/7 of the girls. How many boys took part in the competion?

[Superbugs]

Aitong SA2 P2 Q14


Anyone got solution to angle y? Sorry I do not know how to post the diagram here! Tks