sstrike's answer to Sid's Primary 5 Maths Fractions Singapore question.
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https://en.wikipedia.org/wiki/1_%2B_2_%2B_3_%2B_4_%2B_%E2%8B%AF
Date Posted:
3 years ago
https://betterexplained.com/articles/techniques-for-adding-the-numbers-1-to-100/
Thanks a lot
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