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primary 5 | Maths | Whole Numbers
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PurpleOlive
PurpleOlive

primary 5 chevron_right Maths chevron_right Whole Numbers chevron_right Singapore

Is my child's working correct? I did it via algebra but if I work it backwards, it does not make sense.

Total seashells the girls have=124
Equal no. of seashells the girls have at first=124/2
=62

How can Shulin lose 87 seashells if she only has 62 seashells to start with?

Date Posted: 5 years ago
Views: 504
Mathaddict100
Mathaddict100
5 years ago
The error is with the first working.You have to change the negative sign for both to positive sign.This is because 3x & x is what they have in the end so when you add 25 & 87 respectively,these expression should equal one another.Your claim is wrong..124 is the total they have in the end and not at first.Hope this clarifies the doubt here.

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Mathaddict100
Mathaddict100's answer
534 answers (A Helpful Person)
1st
This is how it is done.Hope this helps as well. :)
PurpleOlive
PurpleOlive
5 years ago
Thank you so much! I was trying to understand the "positive expressions" and after looking at your "checking workings". I understood what you meant already. Thank you again! Now, to explain to my child using their "before and after" concept instead.
Mathaddict100
Mathaddict100
5 years ago
That's good news. :)
Mathaddict100
Mathaddict100
5 years ago
By the way,algebra skills are not tested in pri 5 qns yet so approaching the qn with models will help.Your child will understand the use of algebra in Pri 6.The models is correct here.
PurpleOlive
PurpleOlive
5 years ago
Thank you for sharing this aspect. My child does not go for tuition. We try to guide him ourselves but seems like using non algebra methods is becoming a challenge for us parents instead.
Mathaddict100
Mathaddict100
5 years ago
Yes I understand.It is really nerve-wrecking to understand models myself back in pri school.I use algebra most of the time.It's only now i began to realise that models come from fractions and ratio.It syncs well with these two.Do raise any qn pertaining to models.I'll try my best to help out.
PurpleOlive
PurpleOlive
5 years ago
Grateful thanks for your helping hand. You are spot on about the nerve wrecking part as we are trying our best to refrain from sending him for tuition. I will definitely ask again if I can't figure it out. Thank you!
Mathaddict100
Mathaddict100
5 years ago
Sure no problem. ;)