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4a) 1/12 - 1/20
= ( 1/12 × 5/5) - ( 1/20 × 3/3)
= 5/60 - 3/60
= 2/60
= 1/30

b) 1 8/17 - 5/34
= 1 + ( 8/17 × 2/17) - 5/34
= 1 + 16/34 - 5/34
= 1 11/34

c) 52,3 - 30,45
= 21,85

d) 95,5% - 23%
= 72,5%

e) 38,25 - 26,1
= 12,15

f) 15 6/15 - 3½
= 15 12/30 - 3 15/30
= 14 42/30 - 3 15/30
= 11 27/30
= 11 9/10

5a) 1/6 × ¾
= ½ × ¼
= 1/8

b) 1,2 × 5,6
= 12/10 × 56/10
= 6/5 × 28/5
= 168/25
= 6 18/25

c) 6,25 × 3,5
= 625/100 × 35/10
= 25/4 × 7/2
= 175/8
= 21 7/8

d) 0,12 × 2,38
= 12/100 × 238/100
= 3/25 × 119/50
= 357/1250

e) 3¼ × ⅓
= 13/4 × ⅓
= 13/12
= 1 1/12

f) 6¼ × 2⅜
= 25/4 × 21/8
= 525/32
= 16 13/18