1) The document provides examples of adding lengths with different units including millimeters, centimeters, and meters. It gives the total lengths for a marker pen, light bulb, and fan after adding components of each item in the appropriate units. The document is a math practice for adding lengths expressed in different units.

1. Addition of Length

2. m 100
cm 10
mm

3. Big x small 
x behind  in front

4. Total length of Marker Pen
2 cm 8 cm
2 cm + 8 cm = 10 cm
cm
2 cm 2
+ 8 cm + 8
1 0 cm 10 cm

5. Length of Bulb
56 mm 15 mm
56 mm + 15 mm = cm
‘
56 mm 1cm = 10 mm
+ 15 mm
7 1 mm .
71 mm  10 = 7.1 cm

6. Length of Fan
48 cm 48 cm + 125 cm = m
‘ cm
48
+ 125 cm
1 73 cm 1m = 100 cm
125 cm
173 cm.  100 = 1.73 m

7. Addition of Length
1) 2mm + 17mm = _____mm
2) 35cm + 29cm = ______cm
3) 8cm + 14cm = ______mm
4) 47mm + 28mm = ______cm
5) 78cm + 39cm = _____m