The first one shows 1 cm and 7 mm, we need to convert 7 mm to cm 1 cm + 7 mm = 1 cm + cm = 1 cm + 0.7 cm = 1.7 cm The first one is 1.7 cm
The second one shows 11 inches and 5/16 inches. Between number 11 and 12, there are 16 strips and the pointer lies on fifth strip, thus it show 5/16 inches. The second one is 11 inches.
The third one shows 13 cm and 8 mm. We need to convert mm into cm. 13 cm + 8 mm = 13 cm + 0.8 cm = 13.8 cm The third one is 13.8 mm