1.

Calculate: 1 – 2 + 3 – 4 + 5 – 6 + 7 – 8 + 9 – 10

Answer»

1 – 2 + 3 – 4 + 5 – 6 + 7 – 8 + 9 – 10 

= (1 + 3 + 5 + 7 + 9) – (2 + 4 + 6 + 8 + 10) 

= 25 – 30 

= –5



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