Question

a) Calculati 309-3× (100-72:9)=
c) 84-120:(90×2:10-6)=
d) (99+3)×21×0:7=
e) 104:2+(6+36:6)×5=

Answer 1

a)309-3*(100-72:9)=33
1)72:9=8
2)100-8=92
3)3*92=276
4)309-276=33

c)84-120:(90*2:10-6)=74
1)90*2=180
2)180:10=18
3)18-6=12
4)120:12=10
5)84-10=74

d) (99+3)*21*0*7=0
1)99+3=102
2)102*21=2142
3)2142*0=0
4)0*7=0

e)104:2+(6+36:6)*5=87
1)6+36=42
2)42:6=7
3)104:2=52
4)7*5=35
5)52+35=87

Answer 2

a. 309-3•(100-8)=309-3•92=309-276=33
b. 84-120:(180:10-6)=84-120:(18-6)=84-120:12=84-10=74
c. 102•21•0:7=2142•0:7=0:7=0
d. 104:2+(6+5)•5=104:2+11=52+11=63