Q&A - P3 Math

[Cher2101]

Hi can you please help me on these 2 questions.


1). Bao Ming wants to buy 6 shirts but he is short of $7. If he buys 5 shirts, he will have $11 left. How much money does Bao Ming have?

2). Ben had twice as many books as Eve. If Ben gave Eve 20 books, Ben will have 10 more books than Eve. How many books do they have altogether?

[SAHM Chew]

Cher2101:

Hi can you please help me on these 2 questions.


1). Bao Ming wants to buy 6 shirts but he is short of $7. If he buys 5 shirts, he will have $11 left. How much money does Bao Ming have?

2). Ben had twice as many books as Eve. If Ben gave Eve 20 books, Ben will have 10 more books than Eve. How many books do they have altogether?

1) $11 + $7 = $18
$18 x 5 = $90
$90 + $11 = $101

2) they have 150 books altogether.

[tianzhu]

Cher2101:

2). Ben had twice as many books as Eve. If Ben gave Eve 20 books, Ben will have 10 more books than Eve. How many books do they have altogether?

Hi

Good Morning.

As usual, I've drawn more MD than necessary to show the flow of events.Once a student understands the logic, he/she may consolidate the steps.

Hope this helps.

Best wishes

http://farm8.staticflickr.com/7096/7161777140_e26d1d4f2f_z.jpg\">

[peapot]

Hi what method to use for this q?


Darren has some 10cent coins, 20cent coins and 50 cent coins in his pocket that add up to $2. He has exactly 9 coins. How many 20 cent coins does he have?

I found 2 answers. either 3 twenty cent coins or 7 twenty cent coin. Which should be correct?

[peapot]

if i use guess and check method it will be 7 twenty cent coin.

[peapot]

sorry one more q which I cannot understand why the teacher mark it wrong.


In a quiz, a pupil is awarded 2 sweets for every 7 correct answers. How many sweets will he receive for 56 correct answers? My girl’s answer is 16. Why is it wrong?

[Pris.011283tang]

peapot:

sorry one more q which I cannot understand why the teacher mark it wrong.


In a quiz, a pupil is awarded 2 sweets for every 7 correct answers. How many sweets will he receive for 56 correct answers? My girl's answer is 16. Why is it wrong?

peapot i also arrive at the same answer did u check with the teacher why isit qrong?

2sweets-7 correct answer
4sweets-14
6sweets-21
8sweets-28
10sweets-35
12sweets-42
14sweets-48
16sweets-56

[HAPPYH]

peapot:

sorry one more q which I cannot understand why the teacher mark it wrong.


In a quiz, a pupil is awarded 2 sweets for every 7 correct answers. How many sweets will he receive for 56 correct answers? My girl's answer is 16. Why is it wrong?

Yes, your DD's answer is correct.

[HAPPYH]

peapot:

Hi what method to use for this q?


Darren has some 10cent coins, 20cent coins and 50 cent coins in his pocket that add up to $2. He has exactly 9 coins. How many 20 cent coins does he have?

I found 2 answers. either 3 twenty cent coins or 7 twenty cent coin. Which should be correct?

Other than guess and check, is there any other way to solve this problem (3 variables)? For example, there are few steps we can follow if there is 2 variables (cows and ducks or cars and bicycles) to arrive at the answer. Similarly, is there anything that we can follow to do this sum? My DD can do guess and check only if it is small numbers. Worried what if the numbers get bigger and bigger. Thank you in advance.

[Divha]

Hi,


Could anybody help to solve this problem using model ?

Gina had $75 and Wendy had $125.
After Wendy gave Gina some money, she had $40 less than Gina. How much money did Wendy give to Gina ?

Thanks a lot.