Question

Sum of all the multiples of 4 from 10 to 30 will be

Answer 1

Let us see some multiples of $4$ will be,
$4\times 1=4$
$4\times 2=8$
$4\times 3=12$
$4\times 4=16$
$4\times 5=20$
$4\times 6=24$
$4\times 7=28$
$4\times 8=32$

Multiples of $4$ between $10$ and $30$ are $12,16,20,24$ and $28$.

Sum of these multiples will be $=12+16+20+24+28=100.$