Latitude and longitude practice: read coordinates and check your answers

Latitude vs longitude: what each number means

Latitude measures angular position north or south of the equator. The equator is 0°; the poles are 90° north and 90° south. Lines of equal latitude run around the Earth parallel to the equator. NOAA’s latitude explanation includes a diagram showing those relationships.

Longitude measures angular position east or west of the reference meridian. Longitudes run from 0° to 180° east or west, and meridians meet at the poles. The 180° meridian is on the opposite side of the globe from 0°. See NOAA’s longitude guide for the reference-meridian background. These are angles, so a coordinate in degrees is not a distance in kilometres.

Read the order, then the hemisphere

Every pair in this guide uses latitude first, longitude second. That makes (20°, −40°) 20° north and 40° west. North and east use positive numbers in signed decimal notation; south and west use negative numbers. Letters express the hemisphere directly: 20° S, 40° E becomes (−20°, 40°) in this guide’s order.

Do not assume every tool follows that same order. Some data formats and mapping systems use longitude first. Check the labels or documentation before pasting a pair. Swapping the numbers can produce a valid but completely different location; it does not always trigger an error.

These examples describe mathematical locations, not rounded substitutes for named city centres. Zero needs special care: a point on the equator is neither north nor south of it. Similarly, a point on the 0° meridian is on the boundary between east and west.

Convert degrees, minutes and seconds

A degree contains 60 angular minutes, and each minute contains 60 angular seconds. They describe subdivisions of an angle here, not elapsed time. To convert a magnitude to decimal degrees, use degrees + minutes ÷ 60 + seconds ÷ 3,600, then apply the hemisphere’s sign to the entire result.

For example, 12° 30′ 00″ S becomes −(12 + 30 ÷ 60), or −12.5°. For 7° 15′ 36″ E, calculate 7 + 15 ÷ 60 + 36 ÷ 3,600 = 7.26°. Do not read 12° 30′ as 12.30°: the minutes use sixtieths, not hundredths.

For the reverse direction, take 8.75°: the whole degrees are 8, and 0.75 × 60 gives 45 minutes. Therefore 8.75° W is 8° 45′ 00″ W. Keep the original hemisphere when changing format. Extra decimal places describe a more specific number; they do not prove the underlying measurement is that accurate.

Try ten latitude and longitude practice questions

Write your answers before reading the key. These exercises test coordinate reading and arithmetic; they are not live GeoJig questions. Label your working with latitude and longitude so you can tell a sign mistake from a swapped pair.

1. Which hemispheres contain the point (−18°, 32°)?
2. Write 14° N, 75° W as a signed decimal pair.
3. Is (95°, 20°) a valid latitude-first pair?
4. Is the point (0°, −25°) north or south of the equator?
5. Convert 12° 30′ 00″ S to signed decimal degrees.
6. Convert 7° 15′ 36″ E to decimal degrees.
7. Convert 8.75° W to degrees, minutes and seconds.
8. You stay at 10° N and move 6° east from 20° E. What is the new pair?
9. At the equator, move 5° east from 178° E. Express the new longitude between 180° W and 180° E.
10. Compare (25°, 60°) and (60°, 25°). Are both valid, and do they mean the same place?

Answer key with worked checks

1. Southern and Eastern. The negative latitude means south; the positive longitude means east.
2. (14°, −75°). The west component gets the negative sign.
3. No. Latitude must be between −90° and 90° inclusive.
4. Neither. It lies on the equator, west of the reference meridian.
5. −12.5°. Thirty minutes is half a degree, and south makes the whole magnitude negative.
6. 7.26°. Fifteen minutes contributes 0.25° and 36 seconds contributes 0.01°.
7. 8° 45′ 00″ W. The fractional degree gives 0.75 × 60 = 45 minutes.
8. (10°, 26°). Only longitude changes in the stated movement.
9. 177° W, or −177°. After reaching 180° E, the remaining 3° east wraps to 177° W. The pair is (0°, −177°).
10. Both are valid; they are different places. A range check cannot catch every order mistake.

Why the same degree change does not mean the same distance

Meridians converge towards the poles, so a degree of longitude spans less ground at high latitudes than near the equator. A degree of latitude is much more consistent, although it is not perfectly constant on the real Earth. The USGS explanation of angular distances shows why degrees cannot be treated as a fixed square grid of kilometres.

For a game review, use coordinates to diagnose direction first: wrong hemisphere, too far north, or longitude read backwards. Do not estimate an exact score by subtracting two coordinate pairs. That needs an appropriate surface-distance calculation, not just arithmetic on the degree values.

Connect the worksheet to globe practice

GeoJig does not have a dedicated latitude-and-longitude quiz mode. Use this worksheet separately, then open the game menu and choose Explore to think about the same directions on a 3D Earth. Turn the globe and notice that screen-left is not a permanent geographical direction. The hemisphere you are looking at changes as the view moves.

If your country guesses regularly land in the wrong region, try our country map practice routine next. If you know the right place but cannot position a small-country marker comfortably, use the Precision Mode guide. Coordinate knowledge, regional knowledge and careful aiming each solve a different part of the task.