4)
4x5x2=4x10=40
8x2x2=8x4=32
3x8x3=9x8=72
5)
64+6x5-37=64+30-37=94-37=57
89-3x4+26=89-12+26=77+26=103
56+9x2-40=56+18-40=74-40=34
92-4x7-13=92-28-13=64-13=51
49+4x4+9x3=49+16+27=65+27=92
77-5x4-8x3=77-20-24=57-24=33
7x9-5x7-18=63-35-18=28-18=10
6x6+8x5-2x8=36+40-16=76-16=60
6)
a)9x7+31=63+31=94
b)2x10-9=20-9=11
7)
47+29+18=76+18=94
63-45-9=18-9=9
55+28-42=83-42=41
78+12-36=90-36=54
1x7x5+30=7x5+30=35+30=65
2x2x6-11=4x6-11=24-11=13
