English

Add without using number line: (+ 10) + (+ 3) + (- 8) + (- 9). -

Add without using number line: (+ 10) + (+ 3) + (- 8) + (- 9).

Sum

(+ 10) + (+ 3) + (- 8) + (- 9).

= (+ 13) + (- 17)

= - 4.

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