Solve using suitable property
10+11+12+13++17+18+19+20
Answer :
We have 10 + 11 + 12 + 13 + 17 + 18 + 19 + 20
We know " Associative properties say that it doesn't matter how we group the numbers (i.e. which we calculate first). The solution remains the same .
SO we make group of numbers As :
= ( 10 + 20 ) + ( 11 + 19 ) + ( 12 + 18 ) + ( 13 + 17 )
= 30 + 30 + 30 + 30
= 120 ( Ans )
We have 10 + 11 + 12 + 13 + 17 + 18 + 19 + 20
We know " Associative properties say that it doesn't matter how we group the numbers (i.e. which we calculate first). The solution remains the same .
SO we make group of numbers As :
= ( 10 + 20 ) + ( 11 + 19 ) + ( 12 + 18 ) + ( 13 + 17 )
= 30 + 30 + 30 + 30
= 120 ( Ans )