2)
a) 18+15+22+45
=( 18+22 ) + ( 15+45 )
=40+60
=100
b) 276 +118+324
=( 276+324 )+118
= 600+118
=718
c) 5.9.3.2
=( 5.2 ) . ( 9.3 )
=10.27
=270
d) 25.5.4.27.2
=( 25.4 ) . ( 5.2 ) . 27
=1000.27
=27000
3)
a) 996+45= 996+( 4+41 )= ( 996+4 )+41= 1000+41= 1041
b) 37+198= ( 35+2 )+198= 35=( 2+198 )=35+200= 235
5)
a) =
b) <
c) >
d) <
6)
a) 25.12= 25.( 10+2 )
= 25.10=25.2
=250+50
=300
b) 34.11= 34.( 10+1 )
= 34.10+1.10
= 340+10
= 350
c) 47.101= 47.100+47.1
= 4700+47
=4747
#hoctot
