Q&A - P3 Math

[youngtay]

Hi, please help


The average monthly salary of Hui Hui and her colleagues is S$4,300.00. Hui Hui earns S$4,700 each month and the average monthly salary of her colleagues is S$4,200.00. How many colleagues does she have?

TIA

[Mathmaniac]

youngtay:

Hi, please help


The average monthly salary of Hui Hui and her colleagues is S$4,300.00. Hui Hui earns S$4,700 each month and the average monthly salary of her colleagues is S$4,200.00. How many colleagues does she have?

TIA

Hui Hui earns $4,700-$4,200 = $500 more than an average colleague.

When she is added, average salary increases by $4,300-$4,200 = $100.

Total number of people = 500/100 = 5

Number of colleagues = 5-1 = 4

[youngtay]

Hi, Mathmaniac


Thanks

[Muffins]

A wrord of caution, Just4good,


If you post your comments immediately one after another, with the same words in them i.e. \"Algebra? What's that? :? :? :? Look's hard. Rather :stupid: than answer the question. (Just Kidding)\"

Chief might ban you for trolling the portal...... :slapshead:

[usaik]

Hi,


I need help on the following question.

Estimate the value of 372 ÷ 4

The answer is 360 ÷ 4. So 372 ÷ 4 is about 90. But how do one estimate 372 to be 360. What is the working to show that 372 can be estimated to be 360?

[Modelmatics]

Hi usaik,


To estimate means that we do not need to perform any calculation/working. You can explain to your kid that when we estimate, we want a rough answer quickly, thus we do some quick and convenient mental calculation.

When we perform addition or subtraction estimation, we usually approximate to the nearest tens, hundreds, thousands, etc. However, when we perform multiplication and division estimation, we make use of convenient numbers, i.e., the multiples of numbers/multiplication tables.

For primary kids, they are only required to learn up to 10 times tables. Hence, when they estimate, they should use 2 digits multiples which can be found in the 1 to 10 times table (i.e., 1 x 1 all the way to 10 x 10).

For this question, the first 2 digits are "37" (from the number "372"), thus we use the multiple of "4" closest to "37" which is 36. Therefore, we round it up to "360" making very easy to perform a quick mental calculation, i.e., 36 ÷ 4 = 9, thus 360 ÷ 4 = 90.

For PSLE, the kid’s answer should look like this:

372 ÷ 4 =(here should use "approximately equal to" sign) 360 ÷ 4 = 90

[usaik]

Hi Modelmatics,

Your explanation is extremely clear and hit on the nails those things which I couldn't explan to my kid. :thankyou:

[Modelmatics]

usaik:

Hi Modelmatics,

Your explanation is extremely clear and hit on the nails those things which I couldn't explan to my kid. :thankyou:

Hi usaik,

You're most welcome. Glad to be of help.

[Johnnny Ortiz]

choose either the 4x6 or 5x12 rectangle to show how to solve 1/3 + 5/12=

[Johnnny Ortiz]

Johnnny Ortiz:

choose either the 4x6 or 5x12 rectangle to show how to solve 1/3 + 5/12=

Please help me i need to do my son homework for tommorow!!!!!