John Oon's answer to LC Tan's Primary 3 Maths Singapore question.
What does NA mean in the table mean?
What is the meaning of duplications? I don’t understand. Can you give an example?
If 1 said hello to 2. It is considered they have said hello to each other and we treat 2 said hello to 1 as a duplication.
The working in the book is 9+8+7+6+ 5+4+3+2+1 = 45. can you explain the working without the use of the table? The table is confusing.
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