Xue Jing's answer to Jessica's Primary 6 Maths Algebra Singapore question.
May i ask how to know you need fo divide by 3 and 9?
Thank you by the way
Actually i tried with 1,2,3 4 5 6 7 8 9 1p 11, 12 13. Then realise that only 3 and 9 gives me whole number
You are welcome! This is an interesting question:)
Oh thank you so much for your explanation
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