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primary 6 | Maths
| Data Analysis
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How to find the formula for white and grey.
Total square, i found it.
Date Posted: 9 months ago
Views: 99
observe
# of columns = # fig
(not difficult)
# of rows
tk example of Fig 3
(3 is odd number )
white = grey
⇨ for ODD number fig
white = grey = (n+1)÷2
chk
when n=1
w=g=(1+1)÷2=1
when n=3
w=g=(3+1)÷2=2
...
based on this clue
# of rows
for EVEN number fig, it can be derived from ODD gif number
w = n÷2
g = w+1
chk
when n=2
w=n÷2=1
g = w+1 = 2
when n=4
w=4÷2=2
g = w+1 = 3
(b)
n=15
# of rows
white = grey = (n+1)÷2
= 8
15×8 = 120 (Ans)
(c)
w=80÷2=40
g = 40+1 = 41
80×41 = 3280 (Ans)
https://ask.manytutors.com/questions/138509
PLGMS 2022 prelims
# of columns = # fig
(not difficult)
# of rows
tk example of Fig 3
(3 is odd number )
white = grey
⇨ for ODD number fig
white = grey = (n+1)÷2
chk
when n=1
w=g=(1+1)÷2=1
when n=3
w=g=(3+1)÷2=2
...
based on this clue
# of rows
for EVEN number fig, it can be derived from ODD gif number
w = n÷2
g = w+1
chk
when n=2
w=n÷2=1
g = w+1 = 2
when n=4
w=4÷2=2
g = w+1 = 3
(b)
n=15
# of rows
white = grey = (n+1)÷2
= 8
15×8 = 120 (Ans)
(c)
w=80÷2=40
g = 40+1 = 41
80×41 = 3280 (Ans)
https://ask.manytutors.com/questions/138509
PLGMS 2022 prelims
Thank you so much!!
See 2 Answers
done
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This pattern question is challenging as the formula for even and odd figure numbers are different.
Date Posted:
9 months ago
Wow really difficult!
Yes, I suppose that’s why the question only asked for the odd number figure, which is easier for students to find.
I didnt even notice of the odd & even
How to find figure 80?
done
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FYI → 2019 PSLE
even/odd related
even/odd related
Date Posted:
9 months ago
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