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primary 5 | Maths
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Gautham
Gautham

primary 5 chevron_right Maths

Need fast

Date Posted: 6 years ago
Views: 258

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Rochelle
Rochelle's answer
216 answers (A Helpful Person)
1st
draw model to visualize :)
Gautham
Gautham
6 years ago
Thank you, it was very help ful, but why 12 deducted twice?
Rochelle
Rochelle
6 years ago
as you can see from the model:
w is made up one unit + 12 + 18
R is made up of one unit + 12
C is made up of one unit

so the total of w, r and c is made up of three units + 12 + 12 + 18 :)
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Isabelle Soh
Isabelle Soh's answer
2 answers (Tutor Details)
make use of models and you will be able to visualize the answer :)