Question

1. a) 1/4 x 1.6=
3,6x1/3=
1/6x0,12
b) 2i1/5x1,5=
5 i2/3x1,2=
0,4x3 i 3/4=

2. a) 4/7:3,2=
1,8:2/5=
2,4:1/2=
b) 5,5:2 i 3/4=
3 i 3/5:1,125=
2 i 1/4: 0,75=

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Answer 1

1.
a)
1/4 x 1.6 = 1/4 * 8/5 = 1*2/5 = 2/5
3,6x1/3 = 18/5 * 1/3 = 6/5 = 1 1/5
1/6x0,12 = 1/6 * 6/50 = 1/50
b)
2 1/5 * 1,5 = 11/5 * 15/10 = 11 * 3/10 = 33/10 = 3 3/10 = 3,3
5 2/3 * 1,2 = 17/3 * 6/5 = 17 * 2/5 = 34/5 = 6 4/5
0,4x3 i 3/4 = 2/5 * 15/4 = 1 * 3/2 = 3/2 = 1 1/2

2.
a)
4/7:3,2=4/7 : 16/5 = 4/7 * 5/16 = 1/7 * 5/4 = 5/28
1,8:2/5= 9/5 * 5/2 = 9/2 = 4 1/2
2,4:1/2= 12/5 * 2 = 24/5 = 4 4/5
b)
5,5:2 i 3/4 = 55/10 : 11/4 = 55/10 * 4/11 = 5/5 * 2/1 = 10/5 = 2
3 i 3/5:1,125=18/5 : 1125/1000 = 18/5 :9/8 = 18/5 * 8/9 = 2/5 * 8 = 16/5 = 3 1/5
2 i 1/4: 0,75=9/4 : 3/4 = 9/4 * 4/3 = 3

Answer 2

1. a) 1/4 x 1.6= 1/24
3,6x1/3= 3 3/5 x 1/3 = 18/5 x 1/3 = 18/15 = 1 3/15 = 1 1/5
1/6x0,12= 1/6 x 12/100 = 2/100 = 1/50
b) 2i1/5x1,5= 11/5 x 1 1/2 = 11/5 x 3/2 = 33/10 = 3 3/10
5 i2/3x1,2= 17/3 x 1 1/5 = 17/3 x 6/5 = 102/15 = 6 12/15 = 6 4/5
0,4x3 i 3/4= 2/5 x 15/4 = 30/20 = 1 10/20 = 1 1/2

2. a) 4/7:3,2= 4/7 : 3 1/5 = 4/7 : 16/5 = 4/7 * 5/16 = 5/28
1,8:2/5= 1 4/5 : 2/5 = 9/5 x 5/2 = 9/2 = 4 1/2
2,4:1/2= 2 2/5 : 1/2 = 12/5 x 2 = 24/5 = 4 4/5
b) 5,5:2 i 3/4= 5 1/2 : 11/4 = 11/2 x 4/11 = 2/4 = 1/2
3 i 3/5:1,125= 18/5 : 1 1/8 = 18/5 : 9/8 = 18/5 x 8/9 = 16/5 = 3 1/5
2 i 1/4: 0,75= 9/4 : 3/4 = 9/4 x 4/3 = 9/3 = 3


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