2021 PSLE Discussions and Strategies (Children born in 2009)

[Peteo]

Is this paper 2? Question number? Didn’t check with my son as I want him focus on his other papers.

[blueblood soldier]

My child got the answer of 1.026 kg and it took him too much time to work on that

[wch]

May I know the steps?

james_zyf\" post_id=\"2040094\" time=\"1633072939\" user_id=\"194962:

a. $12, or 1200C
b. 1.026kg

Pinkfellow\" post_id=\"2040092\" time=\"1633072706\" user_id=\"137321:

Helen and Ivan had the same number of coins. Helen had a number of 50-cent coins and 64 20-cent coins. These coins had a mass of 1.134 kg. Ivan had a number of 50-cent coins and 104 20-cent coins .

(a) Who has more money in coins and by how much?(2)

(b) given that each 50-cent coin is 2.7g more heavier than a 20-cent coin, what is the mass of Ivan’s coins in kilograms? (2)

[javjyen]

Peteo\" post_id=\"2040099\" time=\"1633073110\" user_id=\"133311:

Is this paper 2? Question number? Didn’t check with my son as I want him focus on his other papers.

Yes, Question 15.

[hazeline]

Imp75\" post_id=\"2040058\" time=\"1633066746\" user_id=\"2358:

Maybe MOE wants to avoid many getting AL1 and run into a situation that balloting is required for most admission to top sch? There clearly need to be a good differentiation at the highest level to be meritocratic?

I agree that this could be the reason. How then is the AL system less stressful? Parents are more stressed now with the more difficult papers!

[hiya]

a) 104-64=40

40x (0.50-0.20)=$12

b) 40x2.7g=108g
1134g - 108g=1026g or 1.026kg

wch\" post_id=\"2040103\" time=\"1633073465\" user_id=\"6988:

May I know the steps?

james_zyf\" post_id=\"2040094\" time=\"1633072939\" user_id=\"194962:

a. $12, or 1200C
b. 1.026kg
[quote=Pinkfellow post_id=2040092 time=1633072706 user_id=137321]Helen and Ivan had the same number of coins. Helen had a number of 50-cent coins and 64 20-cent coins. These coins had a mass of 1.134 kg. Ivan had a number of 50-cent coins and 104 20-cent coins .

(a) Who has more money in coins and by how much?(2)

(b) given that each 50-cent coin is 2.7g more heavier than a 20-cent coin, what is the mass of Ivan’s coins in kilograms? (2)

[/quote]

[lefrancaisestcool]

wch\" post_id=\"2040103\" time=\"1633073465\" user_id=\"6988:

May I know the steps?

james_zyf\" post_id=\"2040094\" time=\"1633072939\" user_id=\"194962:

a. $12, or 1200C
b. 1.026kg
[quote=Pinkfellow post_id=2040092 time=1633072706 user_id=137321]Helen and Ivan had the same number of coins. Helen had a number of 50-cent coins and 64 20-cent coins. These coins had a mass of 1.134 kg. Ivan had a number of 50-cent coins and 104 20-cent coins .

(a) Who has more money in coins and by how much?(2)

(b) given that each 50-cent coin is 2.7g more heavier than a 20-cent coin, what is the mass of Ivan’s coins in kilograms? (2)

[/quote]Part (a):
Given that they both have the same number of coins, and Ivan has 40 more 20 cent coins than Helen, this means that both Helen has 40 more 50 cent coins than Helen, also meaning that she has more money.
Helen has 40(50C-30C)=$12 more than Ivan

Part (b)
Since Helen had 40 more 50 cent coins than Ivan, therefore her coins are (40x2.7g)=108g heavier than Ivan's coins. Then, simply subtract 108g from 1134g, which equals to 1026g or 1.026kg

[wch]

Thanks!!🙏🙏🙏

[Blissedsher]

lefrancaisestcool\" post_id=\"2040110\" time=\"1633074536\" user_id=\"180808:

wch\" post_id=\"2040103\" time=\"1633073465\" user_id=\"6988:

May I know the steps?
[quote=james_zyf post_id=2040094 time=1633072939 user_id=194962]a. $12, or 1200C
b. 1.026kg

Part (a):
Given that they both have the same number of coins, and Ivan has 40 more 20 cent coins than Helen, this means that both Helen has 40 more 50 cent coins than Helen, also meaning that she has more money.
Helen has 40(50C-30C)=$12 more than Ivan

Part (b)
Since Helen had 40 more 50 cent coins than Ivan, therefore her coins are (40x2.7g)=108g heavier than Ivan's coins. Then, simply subtract 108g from 1134g, which equals to 1026g or 1.026kg[/quote]May I know why minus 30c

[Peteo]

I think now better spend time tackling subsequent papers rather than crying over spilled milk…