Flag 6 grade maths> Add without using number line: (а) 11 + (...
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Add without using number line: (а) 11 + (-7) (b) (-13) + (+18) (c) (-10) + (+19) (d) (-250) + (+150) (e) (-380) + (-270) (f) (-217) + (-100).

Harshit Singh , 4 Years ago
Grade 12th pass
anser 1 Answers
Pawan Prajapati
Solution: (a) 11 + (-7) = 4 + (+7) + (-7) [∵ (+7) + (-7) = 0] = 4 + 0 = 4 Hence, 11 + (-7) = 4. (b) (-13) + (+18) = (-13) + (+13) + (+5) [∵ (-13) + (+13) = 0] = 0 + (+ 5) = 5 Hence, (- 13) + (+ 18) = 5. (c) (-10) + (+19) = (-10) + (+10) + (+9) [∵ (-10) + (10) = 0] = 0 + (+9) = 9 Hence, (-10) + (19) = 9. (d) (-250) + (+150) = (-100) + (-150) + (+150) = (-100) + 0 = -100 [∵(-150) + (+150) = 0] Hence, (-250) + (+150) = – 100. (e) (-380) + (-270) = – [380 + 270] = (-650) Hence, (-380) + (-270) = (-650). (f) (-217) + (-100) = – [217 + 100] = -317
Last Activity: 4 Years ago
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