Q&A - P3 Math

[corneyAmber]

rrjan:

hi ksi and 24hr-mum, nope, there is no typo error....

Where is the source for this question?
It seems erroneous.

[rrjan]

Its from my son’s school’s past year SA2 paper. Will get him to check with the teacher after the PSLE marking days. Thanks

[just888]

rrjan:

Need help on how to explain this P3 Maths question please.....


String P is 8 cm longer than String Q. The total length of String P and String R is 54cm. Find the length of String Q.

Sincere Thanks

I think the question should be like this instead:

String P is 8 cm longer than String Q. The total length of String P and String Q is 54cm. Find the length of String Q.

length of Q = (54-8)/2 = 23
Length of P = 23 + 8 = 31

[just888]

Bay:

mother777:

[quote=\"Bay\"]sorry. The question is incomplete. Glee! Hit the wrong button.


Can someone pls help with this number pattern question?

1st row: 3, 9, 7, 7
2nd row: 4, 16, 13, 26
3rd row: 5, 25, 21, ?

Thanks;)

Hi,

I have tried below, not sure correct :roll:

1st row: 3, 9 (3x3), 7, 7 (7x1)
2nd row: 4, 16 (4x4), 13, 26 (13x2)
3rd row: 5, 25 (5x5), 21, ? [color=#FF0000(21x3 = 63)[/color]

Ans = 63?

whats the answer given?

I do not have the answer as it is a school worksheet. Can only check with the teacher when my ds returns to school on Friday. Will update you on the actual answer.

I have 63 too but not too sure - as the other numbers do not conform to the same pattern (like what mother777 had shown above).

Since KSI and Mother777 had the same answer too, I'll tell my ds to write that as the ans.

Thanks;)[/quote]
there do not seems to have a relation with the 2nd and the 3rd no in each row. Thought in sequence all the numbers in the row are related.

[just888]

just888:

[quote]sorry. The question is incomplete. Glee! Hit the wrong button.


Can someone pls help with this number pattern question?

1st row: 3, 9, 7, 7
2nd row: 4, 16, 13, 26
3rd row: 5, 25, 21, ?

Thanks;)

there do not seems to have a relation with the 2nd and the 3rd no in each row. Thought in sequence all the numbers in the row are related.[/quote]1st row: 3, x3 9 , -2 7, x1 7
2nd row: 4, x4 16, -3 13, x2 26
3rd row: 5, x5 25, -4 21, x3 63

[just888]

24hr-mum:

how to do this?


Lily has red, yellow and blue marbles. 18 were blue. Half of the marbles were yellow, and 1/3 of them were red. how many marbles does she have in total?
lily later gave some red marbles away and was left with equal number of red and blue marbles. how many red marbles did she give away?

No of blue marbles = 1 - 1/2 - 1/3
= 6/6 - 3/6 - 2/6
= 1/6

if 1/6 is 18 marbles
then 6/6 is (18 x 6 ) = 108

Total = 108 marbles

1/3 of red is (18 x 2 ) = 36
Therefore need to give away 36-18 = 18 red marbles

[Andaiz]

rrjan:

String P is 8 cm longer than String Q. The total length of String P and String R is 54cm. Find the length of String Q.

Sincere Thanks

rrjan, believe the second sentence should read \"The total length of String P and Q is 54cm.\" here's my take

P |_____|_8_| }

Q |_____| } 54


54 - 8 = 46
Q = 46/2 = 23 cm.

[24hr-mum]

there are 5 times as many local stamps as there are foreign stamps.

which one is the 5 times and which is the 1 times? foreign or local stamps?

[Andaiz]

24hr-mum:

there are 5 times as many local stamps as there are foreign stamps.

which one is the 5 times and which is the 1 times? foreign or local stamps?

The 5x local stamps and the 1x is foreign.

[24hr-mum]

i thought ‘as many local stamps’ means u r using the local stamps as the base for comparison, so the local is 1x and the foreign is 5x?? i m a bit confused…