Question
Calculate: $1 - 2 + 3 - 4 + 5 - 6 + .................. + 15 - 16$
✓
Answer
$1 - 2 + 3 - 4 + 5 - 6 + 7 - 8 + 9 - 10 + 11 - 12 + 13 - 14 + 15 - 16$
$= (1 + 3 + 5 + 7 + 9 + 11 + 13 + 15) − (2 + 4 + 6 + 8 + 10 + 12 + 14 + 16)$
$= 64 - 72$
$= -8$
$= (1 + 3 + 5 + 7 + 9 + 11 + 13 + 15) − (2 + 4 + 6 + 8 + 10 + 12 + 14 + 16)$
$= 64 - 72$
$= -8$
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
Find. Write and indicate how you solved this. Is$\frac{4}{5}$ equal$\frac{16}{20}$?
→→
Shikha is rowing a boat due north-east. In which direction will she be rowing if she turns it through: a complete angle.
Raju bought a book for $Rs. 35.65.$ He gave $Rs. 50$ to the shopkeeper. How much money did he get back from the shopkeeper?
→subtraction using Brahmagupta’s method:
$\frac{2}{5}-\frac{4}{15}$
→$\frac{2}{5}-\frac{4}{15}$
Express as Rupee (Rs) using decimals: $350$ paisa
→Find the number of lines of symmetry of shape:
Compare the fractions given below: $\frac{3}{8},\frac{5}{6}$
→Define a perfect number. Write two perfect numbers.
Give the prime factorization of the following number: $4335$
→