Q&A - P3 Math

[Jennifer]

Draw a model for the before transfer of water from jug to kettle


_____ 420ml
_____

150ml transferred from jug to kettle will result in the model changed to

150 420 150


The original _____ now split into __ +150 for kettle

so 150 + 420 + 150 = 720 will be divided by 3 (the difference between the kettle and jug)

Jug has 240ml

[tianzhu]

[quote]2)Mrs Raja gave 17 boys and girls a total of 105 clips. Each boy was given 5 clips and each girl was given 7 clips.If all the girls were to give all their clips to the boys, how many more clips would each boy get? [/quote]
Hi
Hope this helps.

You may use a heuristics known as Making a Supposition or Assuming Method.

Suppose all the 17 pupils are girls.

17*7 = 119
119 – 105 = 14 (fewer clips)

Each boy has 2 fewer clips.
Number of boys = 14/2 = 7

Number of girls = 10
Number of clips held by girls = 7*10 = 70

Hence each boy will get 70/7 = 10 clips (more)

Best wishes

[tianzhu]

[quote])Aminah and Shanthinee had 128 bookmarks altogether.Aminah gave 1/4of her bookmarks to geraldine. Shanthinee have the same number of bookmarks left. How many bookmarks had shanthinee have at first? [/quote]
Hi

Are the bookmarks given to Geraldine or Shanthinee?

Please confirm if the numbers are 128 and 1/4.

Best wishes

[WS1234567]

jedamum:

ChiefKiasu:

From Ai Tong Pri 3 SA1 Maths:


A teacher gave her students some balloons. If she gave 6 balloons to each student, she will have 2 balloons left. If she gave 8 balloons to each student, she will be short of 2 balloons. What is the smallest possible number of students she has?

I'll probably use trial and error method and hope that she is not giving out >100 balloons. :lol:
Ans: 2 students...correct?

The question can be solved easily using logic. This is how I explain to my students:

If the teacher gives 6 ballons to each student, she will have 2 left. When she gives two more to each one, she not only uses up the 2 she had left previously, she is going to need 2 more. So, she needs 4 more to make it happen. In that case, she must have given to 2 students since 2 x 2 =4. I prefer to train logic. It makes the kids stronger fundamentally.
Anyway, model-drawing and listing can solve the question too.

Therefore, my working is:
8-6=2
2+2=4
4 divided by 2=2 (students) (answer)

[bookwormkids]

Muffins:

hi bookwormkids, this has a multitude of answers. Maybe the book just picked one of those. Examples of answers would be: 115, 226, 337, 448, 559

Hi Muffins

This was a 2009 SA1 question taken from Maha Bodhi :roll:

Thank you so much for your reply

[tianzhu]

shurley197323:

A Kettle has 420ml more water than a jug. When 150ml of water is poured from the jug into the kettle,there are 4 times as much water in the kettle as the jug. How much water is there in the jug now ?

Hi

Good Morning

This question has been discussed in one of the earlier posts in the P3/P4 Maths thread.

Please follow this link @ page 47.

http://www.kiasuparents.com/kiasu/forum/viewtopic.php?t=149&postdays=0&postorder=asc&start=460

Best wishes

[shurley197323]

Sure. Thanks

[Muffins]

no problem!

[launt]

yeonee:

Hi, I have one question:-


John had 4 times as much money as Jessie. After John received$240 and Jessie received $180, John now has twice as much money as Jessie. How much did they have altogether at first?

Hi, I'm new here, just joined this forum. Let me try to help...
4units + 240 = 2( 1unit + 180)
4units + 240 = 2units + 360
2units = 120
1unit = 60

at first there were 5 units (john 4 + jessie 1)
5 units = 5 x 60 = $300

[shurley197323]

Hi, Jennifer ,Tianzhu. Can I know why must add 2x 150ml.

150ml transfer from the jug to the Kettle ,isn’t it 420ml + 150ml only?
I can’t explain clearly to my child. Please help…