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primary 6 | Maths | Algebra
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jayden
Jayden

primary 6 chevron_right Maths chevron_right Algebra chevron_right Singapore

i need help

Date Posted: 1 year ago
Views: 219

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(a) (5-k) packets of seaweed left

(b) 5-k+2k = (5+k) packets of seaweed
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Tan Wee Hoe
Tan Wee Hoe's answer
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jayden
Jayden
1 year ago
wait i dont understand how does 5-k+2k give u (5+k) ?
Tan Wee Hoe
Tan Wee Hoe
1 year ago
This is algebra.
k is a variable that can represent any number. k can be 1, 2, 3...
In this mathematical expression, 5-k+2k, you cannot add or subtract 5 from the terms with k because you don't know what k represents.
But for the 2 terms with k, you can add/subtract them.
It may be difficult to grasp the concept when you are first learning algebra but after some practice, you should be able to get it.

Just to add, 2k means (2×k).
jayden
Jayden
1 year ago
ohh now i understand ty