1. 2.73 + 0.89 + 1.27
=0.89 +2.73 + 1.27
=0.89 +(2.73 + 1.27
= 0.89 +4
=4.89
2. 4.37 + 0.28 + 1.63 + 5.72
=4.37 + 1.63 + 0.28 + 5.72
=(4.37 + 1.63) +(0.28 + 5.72)
=6+6=12
1. 2.73 + 0.89 + 1.27
=0.89 +2.73 + 1.27
=0.89 +(2.73 + 1.27
= 0.89 +4
=4.89
2. 4.37 + 0.28 + 1.63 + 5.72
=4.37 + 1.63 + 0.28 + 5.72
=(4.37 + 1.63) +(0.28 + 5.72)
=6+6=12