Q&A - P4 Math

[KKKS]

2 x 220 = 440

440 + 128 = 568 cookies (maximum)

[corneyAmber]

concernParent777:

http://i51.tinypic.com/1zg72mb.jpg\">


Hi,

I need some help here for the above question. It looks like using HCF method. Appreciate your answers. Many thanks

The table is 50 by 33.

So to lay the papers to ensure maximum coverage would be to use
the 6 cm to cover the longer side, 50...

Hence it covers up to 48cm with 8 pieces.

The 33cm side covered by 8cm side will need 4 pieces of paper. (covered up to 32cm)

No. of pieces of coloured paper required = 8 x 4 = 32

[MathIzzzFun]

concernParent777:

http://i51.tinypic.com/1zg72mb.jpg\">


Hi,

I need some help here for the above question. It looks like using HCF method. Appreciate your answers. Many thanks

Hi

Use 6cm side to cover 50 cm up to 42 cm ie 7 pieces, with 8cm covering the 33cm side up to 32 cm ie 4 pieces --> total 4 x 7 = 28 pieces.

now, we are left with 8cm x 33cm... use 6cm side to cover the 33 cm side up to 30 cm ie 5 pieces

total 28 + 5 = 33 pieces of 8 x 6 cm

http://i53.tinypic.com/vrsz8l.jpg\">

cheers.

[corneyAmber]

concernParent777:

http://i53.tinypic.com/2vhucs8.jpg\">


Hi,

Need some help here. Thanks

Tip:

Perimeter is always the outer outline of a figure by definition.
Even though this figure has 3 enclosed figures, 2 rects and 1 sq, when perimeter of the entire figure is being asked, you have to drop off the 2 lines inside the new combined figure to calculate the perimeter.

So it is 15 + 5 + 5 + (15-6) + 6 + 6 + (15-6) + 5 + 5 + 15 = 80 cm

[kyy]

Karen had some sweets to give to her friends. If she gave her friends 3 sweets each, she would have 2 sweets left over. But if she gave each friend 4 sweets, she would need another 3 sweets. How many sweets did Karen have?


My child got this sum wrong and she wrote her corrections as such:
No of Friends —2+3=5
No. of Sweets 3x5+2 = 17

Neither she nor I can understand the logic behind the above number statements. Can someone help explain please?

Thanks

[MathIzzzFun]

kyy:

Karen had some sweets to give to her friends. If she gave her friends 3 sweets each, she would have 2 sweets left over. But if she gave each friend 4 sweets, she would need another 3 sweets. How many sweets did Karen have?


My child got this sum wrong and she wrote her corrections as such:
No of Friends ---2+3=5
No. of Sweets 3x5+2 = 17

Neither she nor I can understand the logic behind the above number statements. Can someone help explain please?

Thanks

hi,

\"If she gave her friends 3 sweets each, she would have 2 sweets left over.\"
- imagine now each friend has 3 sweets and Karen has 2 sweets left.

To give each friend 4 sweets - ie to give 1 more to each friend, she needs 3 more sweets. This means she needs a total of 2 + 3= 5sweets so that she could give 1 more to each friend.

Total number of friends is therefore = 5

Total number of sweets = 5 (number of friends) x 3 (if she gives 3 sweets to each) + 2 (she has 2 sweets left) = 17

cheers.

[kyy]

MathIzzzFun:

kyy:

Karen had some sweets to give to her friends. If she gave her friends 3 sweets each, she would have 2 sweets left over. But if she gave each friend 4 sweets, she would need another 3 sweets. How many sweets did Karen have?


My child got this sum wrong and she wrote her corrections as such:
No of Friends ---2+3=5
No. of Sweets 3x5+2 = 17

Neither she nor I can understand the logic behind the above number statements. Can someone help explain please?

Thanks

hi,

\"If she gave her friends 3 sweets each, she would have 2 sweets left over.\"
- imagine now each friend has 3 sweets and Karen has 2 sweets left.

To give each friend 4 sweets - ie to give 1 more to each friend, she needs 3 more sweets. This means she needs a total of 2 + 3= 5sweets so that she could give 1 more to each friend.

Total number of friends is therefore = 5

Total number of sweets = 5 (number of friends) x 3 (if she gives 3 sweets to each) + 2 (she has 2 sweets left) = 17

cheers.

Hi MathIzzzfun,

Thanks for your help, however, I don't quite get the part about,
\"This means she needs a total of 2 + 3= 5sweets so that she could give 1 more to each friend. \"

Where do you derive the 2 and 3? Would you be able to elaborate more on this please?

Thanks

[MathIzzzFun]

kyy:

MathIzzzFun:

Karen had some sweets to give to her friends. If she gave her friends 3 sweets each, she would have 2 sweets left over. But if she gave each friend 4 sweets, she would need another 3 sweets. How many sweets did Karen have?


My child got this sum wrong and she wrote her corrections as such:
No of Friends ---2+3=5
No. of Sweets 3x5+2 = 17

Neither she nor I can understand the logic behind the above number statements. Can someone help explain please?

Thanks

hi,

\"If she gave her friends 3 sweets each, she would have 2 sweets left over.\"
- imagine now each friend has 3 sweets and Karen has 2 sweets left.

To give each friend 4 sweets - ie to give 1 more to each friend, she needs 3 more sweets. This means she needs a total of 2 + 3= 5sweets so that she could give 1 more to each friend.

Total number of friends is therefore = 5

Total number of sweets = 5 (number of friends) x 3 (if she gives 3 sweets to each) + 2 (she has 2 sweets left) = 17

cheers.

Hi MathIzzzfun,

Thanks for your help, however, I don't quite get the part about,
\"This means she needs a total of 2 + 3= 5sweets so that she could give 1 more to each friend. \"

Where do you derive the 2 and 3? Would you be able to elaborate more on this please?

Thanks

Hi

Supposing the question is ...
Karen has 2 sweets. If she wants to give one sweet to each of her friends she will need another 3 sweets. How many friends does she have ?
- for this question, we start with 2 sweets. If we want to give 1 to each friend, we will be short of 3 sweets - this means that total number of sweets needed will be 2 (already have) + 3 (short) = 5.

Similarly, for the given question -

\"If she gave her friends 3 sweets each, she would have 2 sweets left over.\" - so we imagine that she have given 3 sweets to each, and Karen has 2 sweets left.

\"if she gave each friend 4 sweets, she would need another 3 sweets.\" - since each friend already has 3 sweets, to give each friend 4 sweets means to give 1 more to each friend. She will need 3 more - so total number of sweets needed = 2 (left over) + 3 (short) = 5 --> so there are 5 friends.

hope this model helps

http://i51.tinypic.com/9r3pjq.jpg\">


cheers.

[PiggyLalala]

MathIzzzFun:

kyy:

Karen had some sweets to give to her friends. If she gave her friends 3 sweets each, she would have 2 sweets left over. But if she gave each friend 4 sweets, she would need another 3 sweets. How many sweets did Karen have?


My child got this sum wrong and she wrote her corrections as such:
No of Friends ---2+3=5
No. of Sweets 3x5+2 = 17

Neither she nor I can understand the logic behind the above number statements. Can someone help explain please?

Thanks

hi,

\"If she gave her friends 3 sweets each, she would have 2 sweets left over.\"
- imagine now each friend has 3 sweets and Karen has 2 sweets left.

To give each friend 4 sweets - ie to give 1 more to each friend, she needs 3 more sweets. This means she needs a total of 2 + 3= 5sweets so that she could give 1 more to each friend.

Total number of friends is therefore = 5

Total number of sweets = 5 (number of friends) x 3 (if she gives 3 sweets to each) + 2 (she has 2 sweets left) = 17

cheers.

Thank you MathsIzzzFun. Have come across this type of sums. Your solution provides another way of doing the question. Will explain using this method to my ds again. Hope he can grasp the concept better with this new method. Previously we have solved the question using model but ds cant grasp the concept fully. :thankyou: for your alternative method

[kyy]

Hi,


I can understand where the 2+3=5 comes from now but I still can’t grasp why
2 (left over) + 3 (short) = 5 –> so there are 5 friends.