Group the terms and find the sum — task. Maths CBSE Live product, Class 7 (2026-27).

Fill in the blanks:

(i) \((30 + 40) + 90 =\) \(+\) 90 \(=\)

(ii) \((-20 + 70) + 40 =\) \(+\) 40 \(=\)

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