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Operations on Whole Numbers — Maths STD 6 — Question

Maharashtra BoardEnglish MediumSTD 6MathsOperations on Whole Numbers3 Marks
Question
10 + 11 + 12 + 13 + 14 + 15 + 16 + 17 + 18 + 19 + 20
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Answer

10 + 11 + 12 + 13 + 14 + 15 + 16 + 17 + 18 + 19 + 20
10 + 20 = 30
1 + 9 = 10
2 + 8 = 10
3 + 7 = 10
And,
4 + 6 = 10
Therefore,
(10 + 20) + (11 + 19) + (12 + 18) + (13 + 17) + (14 + 16)
= 30 + 30 + 30 + 30 + 30 + 15
= 150 + 15
= 165

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