这个应该是几年级的题？

[lanlandetian]

请看看这个题，应该属于几年级的孩子做的。谢谢。

Alan has 4 coins. Beth has 2 coins. Beth has 2 cents more than Alan. What coins does each have?

 

[oureal]

要看让哪的学生做了。如果国内学校的学生的话，估计小学一年级就行。如果是这边加拿大学校的话，至少是小学五-六年级的题吧。

 

[ccc]

如果是加拿大学生的话，至少是小学6-7年级的题吧。

 

[oureal]

认钱是认钱，问题是 dime,nickle和penny都搅和在一起，那小孩不发蒙呀。

 

[ccc]

认钱是认钱，问题是 dime,nickle和penny都搅和在一起，那小孩不发蒙呀。

Plus loonies and twonies.

 

[hcloud]

楼上说１年级的， 请先把答案想出来。。。

 

[oureal]

楼上说１年级的， 请先把答案想出来。。。

第一个孩子：一个 dime,三个penny
第二个孩子：一个dime,一个nickle

 

[hcloud]

My though process goes:

The only thing that can make up a 2-cent more is (brackets denote the number of coins different between the two persons)
Nickel vs Penny x 3 (2)
or
Penny x 2 vs Nothing (-2)
or
Dime vs Penny x 3 + Nickel (-3)

The rest just flows... The problem is this thought process isn't exactly taught in early grades.

 

[hcloud]

第一个孩子：一个 dime,三个penny
第二个孩子：一个dime,一个nickle

You can substitute the dime by any other coins, it's irrelevant.

 

[lanlandetian]

其实这个题是我孩子（一年级，加拿大）的problem of the week，昨天带回来，今天没有交回去，对一年级的孩子来讲，太复杂了。牵涉到好几个变量，还有组合问题。

 

[ccc]

第一个孩子：一个 dime,三个penny
第二个孩子：一个dime,一个nickle

It could also be:

Alan: 1 nickel and 3 pennies (4 coins, 8 cents)
Beth: 2 nickels (2 coins, 10 cents)

So, Alan has 4 coins. Beth has 2 coins. Beth has 2 cents more than Alan.

 

[sable93]

4 c and 6 c

 

[hcloud]

1 anything + 3 pennies
1 anything + 1 nickel

 

[ccc]

1 anything + 3 pennies
1 anything + 1 nickel

Correct! (just that "anything" stands for the same kind of coin.)

 

[oureal]

Correct!

也不精确！那个” any coins" 必须是同币值的。
我说咱们这些叔叔大爷们别和小孩子们争谁聪明了，行不？