Question

student handout: unit 3 lesson 2

1. complete the following chart.

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object	actual measurement	mm	cm	m	km
length of bulletin board
diameter of a dime
width of a student’s desk
width of the teacher’s desk
length of a new pencil
length of a small paper clip
length of the classroom

Explanation:

Step1: Recall conversion factors

1 cm = 10 mm, 1 m = 100 cm, 1 km = 1000 m.

Step2: Estimate actual measurements

• Length of bulletin board: Let's assume 150 cm.
• In mm: $150\times10 = 1500$
• In m: $150\div100=1.5$
• In km: $1.5\div1000 = 0.0015$
• Diameter of a dime: Assume 18 mm (or 1.8 cm).
• In cm: 1.8
• In m: $1.8\div100 = 0.018$
• In km: $0.018\div1000=0.000018$
• Width of a student's desk: Assume 60 cm.
• In mm: $60\times10 = 600$
• In m: $60\div100 = 0.6$
• In km: $0.6\div1000=0.0006$
• Width of the teacher's desk: Assume 120 cm.
• In mm: $120\times10 = 1200$
• In m: $120\div100 = 1.2$
• In km: $1.2\div1000 = 0.0012$
• Length of a new pencil: Assume 18 cm.
• In mm: $18\times10 = 180$
• In m: $18\div100 = 0.18$
• In km: $0.18\div1000=0.00018$
• Length of a small paper - clip: Assume 30 mm (or 3 cm).
• In cm: 3
• In m: $3\div100 = 0.03$
• In km: $0.03\div1000=0.00003$
• Length of the classroom: Assume 800 cm (or 8 m).
• In mm: $800\times10 = 8000$
• In m: 8
• In km: $8\div1000 = 0.008$

Answer:

Object	Actual Measurement	mm	cm	m	km
length of bulletin board	150 cm	1500	150	1.5	0.0015
diameter of a dime	1.8 cm	18	1.8	0.018	0.000018
width of a student's desk	60 cm	600	60	0.6	0.0006
width of the teacher's desk	120 cm	1200	120	1.2	0.0012
length of a new pencil	18 cm	180	18	0.18	0.00018
length of a small paper clip	3 cm	30	3	0.03	0.00003
length of the classroom	8 m	8000	800	8	0.008