Q&A - P3 Math

[veraclari]

Hi, errmm to add on to Just4Good's answer, since total is 108 and we know that red is 4/12 hence there are 36 red marbles. and since there are equal red and blue now I.e. 18, so lily must hv given away 18 marbles, I think?

[corneyAmber]

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?

1/3 = 2/6 -> red
1/2 = 3/6 ->yellow
1 part (1/6) -> blue : 18
6 parts -> 18*6 = 108 marbles in total.

red marbles -> 2 parts -> 36
blue marbles -> 18
So to have equal number of red and blue marbles left, i.e. 18 each, she gave away (36-18) = 18 red marbles.

[Bay]

mother777:

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;)

[rrjan]

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

[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