=4715
Simplifying 123+245.
123+245=53+145
Taking the LCM,
53+145=5(5)+14(3)15
=6715
Verify commutativity of addition of rational numbers for each of the following pairs of rational numbers: (i) −115 and 47 (ii)49 and 7−12 (iii) −35 and −2−15 (iv) 2−7 and 12−35 (v) 4 and −35 (vi) −4 and 4−7