See AC Lim's answer to Gens's Primary 6 Maths Measurement Singapore question

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Hope this help

Date Posted: 5 years ago

Gens

5 years ago

thanks for the enlightenmenr

AC Lim

5 years ago

Still work hard for b and d :)

Gens

5 years ago

thanks so much. i took a long time but still can’t get the pattern. your enlightenment for a and c really helps a lot.