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Primary 4 | Maths
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kinn yong
Kinn Yong

Primary 4 chevron_right Maths chevron_right Singapore

how do i solve this using Difference Unchanged?

Date Posted: 9 months ago
Views: 152
sstrike
Sstrike
9 months ago
concept

difference unchanged

pls hv a try?
kinn yong
Kinn Yong
9 months ago
tried the concept but still cant figure it out
sstrike
Sstrike
9 months ago
2×2×120÷3 = 160 (Ans)

pls refer to the model attached

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sstrike
Sstrike's answer
5327 answers (A Helpful Person)
1st
kinn yong
Kinn Yong
9 months ago
Thanks so much Sstrike! can u further explain how you derive this?
sstrike
Sstrike
9 months ago
At first
C-T = 7-1=6
In the end
C-T = 3-1=2

How to align the difference to be same ?

As this is P4 question
Not learn ratio (P5) yet
So model is drawn for your reference
kinn yong
Kinn Yong
9 months ago
i divide the 2 parts into 6?
sstrike
Sstrike
9 months ago
R u parents?

6 parts divided by 2

2×?=6u
sstrike
Sstrike
9 months ago
at first
C:T:C-T = 7:1:6

in the end
C:T:C-T = 3:1:2 = 9:3:6

change
= 9-7 = 3-1 = 2 units

3u = 120

tables in total (after)
1 unit = 120÷3 = 40

2u = 2×40 = 80

All in total bought
2×80 = 160 (Ans)
kinn yong
Kinn Yong
9 months ago
no