Q&A - P2 Math

[Sun_2010]

Lexmark:

Please help:

Write the greatest 2-digits number such that the sum of the two digits is 10.
TQ!

91 ?

[Lexmark]

TQ.

Teacher marked as wrong, now I’m not sure…
1. Write the greatest 2-digit number such that the sum of the two digits is 10. (not 91?)
2. Write the greatest 3-digit number such that the sum of the three digits is 20.(not 992?)
3. Write the smallest 3-digit number such that the sum of the three digits is 15.(not 159?)

[Just4Good]

Lexmark:

TQ.

Teacher marked as wrong, now I'm not sure...
1. Write the greatest 2-digit number such that the sum of the two digits is 10. (not 91?)
2. Write the greatest 3-digit number such that the sum of the three digits is 20.(not 992?)
3. Write the smallest 3-digit number such that the sum of the three digits is 15.(not 159?)

Huh? Maybe teacher marked wrongly? :?

[jolenekoh]

Please help... How to draw model for this question or table method?


There is a total of 12 cows and ducks on a farm. They have 38 legs altogether. How many cows are there on the farm?

Appreciated

[verykiasumummy]

jolenekoh:

Please help... How to draw model for this question or table method?


There is a total of 12 cows and ducks on a farm. They have 38 legs altogether. How many cows are there on the farm?

Appreciated

need to use guess and check for this question.

draw a table with 4 columns, not model.

1st column : No. of cows x 4 legs
2nd column : No. of ducks x 2 legs
3rd column : Total legs
4th column : Check

keep guessing the different combination of numbers for no. of cows and ducks, try with 6 cows and 6 ducks first to get total 36 legs and under check column put a cross.. then try on the next row with 7 cows and 5 ducks and you will get total 38 legs, under check column, put a tick..

hope u get what i mean..

[jolenekoh]

verykiasumummy:

jolenekoh:

Please help... How to draw model for this question or table method?


There is a total of 12 cows and ducks on a farm. They have 38 legs altogether. How many cows are there on the farm?

Appreciated

need to use guess and check for this question.

draw a table with 4 columns, not model.

1st column : No. of cows x 4 legs
2nd column : No. of ducks x 2 legs
3rd column : Total legs
4th column : Check

keep guessing the different combination of numbers for no. of cows and ducks, try with 6 cows and 6 ducks first to get total 36 legs and under check column put a cross.. then try on the next row with 7 cows and 5 ducks and you will get total 38 legs, under check column, put a tick..

hope u get what i mean..

Hi... Ya I got it, I got a problem to explain to my boy... zzzzz P1 I using circle as animals to draw the legs...hahahahah. He told me got a table method. But he not sure and so he \"always\" copy from his friend. NOw he know the consequences...zzzzz

[verykiasumummy]

the guess and check method will be taught and tested in the tests and exams in p3 onwards… must know how to do…

[jolenekoh]

verykiasumummy:

the guess and check method will be taught and tested in the tests and exams in p3 onwards... must know how to do..

Thank you. Just tried with him the column starts from 1 cow and 1 duck so total = 6 legs... than move from there... hope he get it

[verykiasumummy]

jolenekoh:

verykiasumummy:

the guess and check method will be taught and tested in the tests and exams in p3 onwards... must know how to do..

Thank you. Just tried with him the column starts from 1 cow and 1 duck so total = 6 legs... than move from there... hope he get it

sorry no... u have to use numbers for both cow and duck that add up to 12 because question says total 12 animals..

so u can play with :

4 cow 8 duck
5 cow 7 duck
6 cow 6 duck
7 cow 5 duck

[jolenekoh]

verykiasumummy:

jolenekoh:

[quote=\"verykiasumummy\"]the guess and check method will be taught and tested in the tests and exams in p3 onwards... must know how to do..

Thank you. Just tried with him the column starts from 1 cow and 1 duck so total = 6 legs... than move from there... hope he get it

sorry no... u have to use numbers for both cow and duck that add up to 12 because question says total 12 animals..

so u can play with :

4 cow 8 duck
5 cow 7 duck
6 cow 6 duck
7 cow 5 duck[/quote]
Okay, I got it. Thank you