Q&A - P4 Math

[chloecube]

HI,


i have 3 questions that i need help on.

¼ of Hito’s marbles is equal to 1/5 of Troy’s marbles. If they have 36 marbles altogether, how many marbles does Troy have?
Ans 20 but i need the working to explain to DS

Troy baked some cakes to sell at a fair. He sold 80 cakes in the morning and 2/5 of the remaining in the afternoon. The number of cakes not sold was equal to 1/5 of the cakes he baked. How many cales did Troy bake?

There are 80 pupils in Class A and Class B. 4/9 of pupils in Class A are boys and 3/5 of the pupils Class B are girls.
a)\tHow many pupils are there in Class A?
b)\tHow many boys are there in both classes?

[BigDevil]

chloecube:

HI,


i have 3 questions that i need help on.

¼ of Hito’s marbles is equal to 1/5 of Troy’s marbles. If they have 36 marbles altogether, how many marbles does Troy have?
Ans 20 but i need the working to explain to DS

http://i44.tinypic.com/33d8r2w.jpg\">

[chloecube]

BigDevil:

chloecube:

HI,


i have 3 questions that i need help on.

¼ of Hito’s marbles is equal to 1/5 of Troy’s marbles. If they have 36 marbles altogether, how many marbles does Troy have?
Ans 20 but i need the working to explain to DS

http://i44.tinypic.com/33d8r2w.jpg\">

thank you BigDevil

[MathIzzzFun]

chloecube:

HI,


i have 3 questions that i need help on.

¼ of Hito’s marbles is equal to 1/5 of Troy’s marbles. If they have 36 marbles altogether, how many marbles does Troy have?
Ans 20 but i need the working to explain to DS

Troy baked some cakes to sell at a fair. He sold 80 cakes in the morning and 2/5 of the remaining in the afternoon. The number of cakes not sold was equal to 1/5 of the cakes he baked. How many cales did Troy bake?

There are 80 pupils in Class A and Class B. 4/9 of pupils in Class A are boys and 3/5 of the pupils Class B are girls.
a)\tHow many pupils are there in Class A?
b)\tHow many boys are there in both classes?

Hi

Q2...

http://i39.tinypic.com/sb262t.jpg\">

cheers.

[MathIzzzFun]

chloecube:

HI,


i have 3 questions that i need help on.

¼ of Hito’s marbles is equal to 1/5 of Troy’s marbles. If they have 36 marbles altogether, how many marbles does Troy have?
Ans 20 but i need the working to explain to DS

Troy baked some cakes to sell at a fair. He sold 80 cakes in the morning and 2/5 of the remaining in the afternoon. The number of cakes not sold was equal to 1/5 of the cakes he baked. How many cales did Troy bake?

There are 80 pupils in Class A and Class B. 4/9 of pupils in Class A are boys and 3/5 of the pupils Class B are girls.
a)\tHow many pupils are there in Class A?
b)\tHow many boys are there in both classes?

Hi

Q3 is interesting - may I know the source of this question.

Total number of pupils in Class A and Class B --> 80

Number of pupils in Class A is a multiple of 9 and number of pupils of Class B is a multiple of 5. Since the total number 80 is a multiple of 5, then the number of pupils in Class A must also be a multiple of 5.

This means that the number of pupils in Class A is a multiple of 5 & 9 --> 45, 90, 135...so, there are 45 pupils in Class A

Number of pupils in Class B --> 80 - 45 = 35... with this, (b) can be worked out.

cheers.

[chloecube]

MathIzzzFun:

chloecube:

HI,


i have 3 questions that i need help on.

¼ of Hito’s marbles is equal to 1/5 of Troy’s marbles. If they have 36 marbles altogether, how many marbles does Troy have?
Ans 20 but i need the working to explain to DS

Troy baked some cakes to sell at a fair. He sold 80 cakes in the morning and 2/5 of the remaining in the afternoon. The number of cakes not sold was equal to 1/5 of the cakes he baked. How many cales did Troy bake?

There are 80 pupils in Class A and Class B. 4/9 of pupils in Class A are boys and 3/5 of the pupils Class B are girls.
a)\tHow many pupils are there in Class A?
b)\tHow many boys are there in both classes?

Hi

Q3 is interesting - may I know the source of this question.

Total number of pupils in Class A and Class B --> 80

Number of pupils in Class A is a multiple of 9 and number of pupils of Class B is a multiple of 5. Since the total number 80 is a multiple of 5, then the number of pupils in Class A must also be a multiple of 5.

This means that the number of pupils in Class A is a multiple of 5 & 9 --> 45, 90, 135...so, there are 45 pupils in Class A

Number of pupils in Class B --> 80 - 45 = 35... with this, (b) can be worked out.

cheers.

Thks MathIzzzFun
i got this question from +Venture, it is a Math worksheet subscribe from the school.
i have a hard time solving this and still cannot comprehend what exactly they are asking :faint:

[MathIzzzFun]

chloecube:

MathIzzzFun:

HI,


i have 3 questions that i need help on.

¼ of Hito’s marbles is equal to 1/5 of Troy’s marbles. If they have 36 marbles altogether, how many marbles does Troy have?
Ans 20 but i need the working to explain to DS

Troy baked some cakes to sell at a fair. He sold 80 cakes in the morning and 2/5 of the remaining in the afternoon. The number of cakes not sold was equal to 1/5 of the cakes he baked. How many cales did Troy bake?

There are 80 pupils in Class A and Class B. 4/9 of pupils in Class A are boys and 3/5 of the pupils Class B are girls.
a)\tHow many pupils are there in Class A?
b)\tHow many boys are there in both classes?

Hi

Q3 is interesting - may I know the source of this question.

Total number of pupils in Class A and Class B --> 80

Number of pupils in Class A is a multiple of 9 and number of pupils of Class B is a multiple of 5. Since the total number 80 is a multiple of 5, then the number of pupils in Class A must also be a multiple of 5.

This means that the number of pupils in Class A is a multiple of 5 & 9 --> 45, 90, 135...so, there are 45 pupils in Class A

Number of pupils in Class B --> 80 - 45 = 35... with this, (b) can be worked out.

cheers.

Thks MathIzzzFun
i got this question from +Venture, it is a Math worksheet subscribe from the school.
i have a hard time solving this and still cannot comprehend what exactly they are asking :faint:

Hi

this question would normally be solved using Guess & Check if the students have not learnt multiples/factors

4/9 of pupils in Class A are boys --> number of pupils in Class A is a multiple of 9 ie divisible by 9

3/5 of the pupils Class B are girls --> number of pupils in Class B is a multiple of 5.

cheers.

[chloecube]

Hi Mathizzzfun,


according to the worksheet, this is a typical PSLE type of question, not nesscessarily for just P4.
i think its good to expose DS to such question now for him to be ready in 2 yrs time.

thks for helping

[chloecube]

A)What number am I? Two-thirds of it is 40. Two-fifths of it is 24.


B)min is 18 yr older than Ann. In 6 yr time, she will be twice as old as Ann. How old is Ann now?

[chloecube]

The value of 5 in the ten thousands place is ______times it’s value in the hundreds place.

A) 10000. B) 1000 c) 100. D) 10


I do not understand what the question is asking