Question

If we have to sum 1+3+5+7+9+11+13+15+17+19+21+23+25+27+29+31+33+35+37+39.so, can anyone tell me, how can we solve this addition in very easy way without any using calculator.​

Answer 1

Answer:

doing this will be interesting without calculator:-

1+39=40 1

3+37=40 2

5+35=40 3

7+33=40 4

9+31=40 5

11+29=40 6

13+27=40 7

15+25=40 8

17+23=40 9

19+21=40 10

#we saw there are 10 times 40 so 40×10=400

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Answer 2

Answer:

all digit is 20 (20)(20) is 400 answer