Chua Xin Yi's answer to Peiying's Primary 4 Maths Singapore question.

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Chua Xin Yi
Chua Xin Yi's answer
4 answers (Tutor Details)
1st
Follow multiplication of 5,
5, 10, 15, 20, 25.....

To find the sum is to add the first 3 above numbers together: 5 + 10 + 15 = 30