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SCALE Why do we need a scale? • A map maker puts important information about a large piece of land on to a small of piece of paper. • The SCALE of a map is the length used on the map to represent a certain distance on the ground. Why is scale important? • The map maker basically “shrinks” everything on the land to fit onto the paper. • If the map maker didn’t shrink to scale, everything would be skewed. • Scale is important because it keeps everything at the same ratio. Why do we need a scale? • A map maker puts important information about a large piece of land on to a small of piece of paper. • The SCALE of a map is the length used on the map to represent a certain distance on the ground. Now that you know why we NEED SCALES... Scales can be expressed in 3 WAYS: LINE SCALE: • A line drawn on a map that represents distances on the ground. WRITTEN SCALE: • A scale represented by a written phrase. RATIO SCALE: • When given a ratio scale of 1:100 000, it means that 1 cm on the map represents 100 000 cm in real life. How do I Convert? CM → KM • Divide by 100,000 • Move the decimal 5 places to the left KM → CM • Multiply by 100,000 • Move the decimal 5 places to the right Scale Conversion Practice: CM to KM Move decimal 5 left ← KM to CM Move decimal 5 right → Written Scale Ratio Scale 1 cm = 1km 1: 100 000 1 cm = 250km 1: 25,000,000 1 cm = 0.5 km 1: 50 000 1 cm =11.25 km 1: 1,125,000 Measure line length X both sides by length (i.e. 8 cm) Line Scale 0 2 0 0 0km 4 6 1,000 1 2 30 8 km 2,000km 3 60 4km 90