UPSKILL MATH PLUS

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Fill in the blanks: 
 
(i) \((​30​ + ​40​) + ​70​ =\) ​​ \(+\) ​70​ \(=\) ​
 
(ii) \((​-10​ + ​60​) + ​20​ =\) ​​ \(+\) ​20​ \(=\) ​​