About P6 Maths(10marks)

1) 18.59-(8.347+6.99)=
3.253

2) 6.88*12.55
86.344

3) 8 3/4*?=28
=> 35/4* ?=28
=> ?=3.2

4) a/8*b/a*8/b=
1

5) 61 1/2/1 1/2
(Don't understand the question)

6) (800-1/10)-(800-1/8)
=800-1/10-800+1/8
= -1/10+1/8
= -8/80+10/80
=2/80
=1/40