Convert rates and measurements: metric units

Key Notes:

📏 What is the Metric System?

• The metric system is a standard way of measuring used worldwide 🌍
• It is based on powers of 10 🔟➜100➜1000 — making conversions easy!

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🔑 Basic Metric Units

Measurement	Unit	Symbol	Example
Length 📏	metre	m	5 m
Mass ⚖️	gram	g	250 g
Volume 💧	litre	L	2 L

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🔄 Metric Prefixes & Values

Prefix	Symbol	Meaning	Multiply by
kilo 🚚	km / kg / kL	thousand	× 1,000
hecto 💯	hm / hg / hL	hundred	× 100
deca 🔟	dam / dag / daL	ten	× 10
base unit ✨	m / g / L	one	× 1
deci 🔽	dm / dg / dL	tenth	÷ 10
centi 🧵	cm / cg / cL	hundredth	÷ 100
milli 🍼	mm / mg / mL	thousandth	÷ 1,000

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🔁 Quick Conversion Trick

👉 Move the decimal point!

• To convert bigger → smaller, 👉 move decimal to the right ➡️
• To convert smaller → bigger, 👉 move decimal to the left ⬅️

📍 Example:

• 3.5 km → m: km to m = ×1000 → 3,500 m
• 650 m → km: m to km = ÷1000 → 0.65 km

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⚖️ Converting Between Units (Examples)

Length 📏

• 1 km = 1,000 m
• 1 m = 100 cm
• 1 cm = 10 mm

Mass 💪

• 1 kg = 1,000 g
• 1 g = 1,000 mg

Capacity/Volume 💧

• 1 L = 1,000 mL

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🚀 Converting Rates

A rate compares two different units (e.g., km/h, m/s, L/min).

✅ Examples:

• 60 km/h to m/s
  → Multiply by 1000/3600 or divide by 3.6
  → 60 km/h ÷ 3.6 = 16.67 m/s
• 300 mL/min to L/min
  → 300 ÷ 1000 = 0.3 L/min

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💡 Tips to Remember

✨ Write the units before converting
🔁 Practice moving decimal places
📐 Use a metric ladder to go up or down
🧠 Always check if final unit is correct

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🎯 Why Learn Conversions?

• Used in science experiments 🧪
• Helps in shopping & cooking 🍳
• Needed for travel & speed calculations 🚗
• Useful in medicine 💊 (mL to L, mg to g)

Learn with an example

let’s practice!