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Puzzles with Eder: Which numbers solve this problem?: Hidden addition – can you figure out these numbers?
spektrum.de/raetsel/welche-zahlen-loesen-diese-aufgabe/2085171

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Puzzles with Eder: How long are the edges?: How can the length of the two edges be determined?
spektrum.de/raetsel/wie-lang-sind-die-kanten/2243432

How long is the radius?: How can the length of the radius be determined?
spektrum.de/raetsel/wie-lang-ist-der-radius/2243705

What number does n represent?: What number is represented by the natural number n?
spektrum.de/raetsel/fuer-welche-zahl-steht-n/2084802

How are the doors labeled?: The incomplete Advent calendar - | how should the numbers be distributed?
spektrum.de/raetsel/wie-werden-die-tuerchen-beschriftet/2087352

What numbers are hidden behind the two question marks?: What numbers do the two question marks in the pentagon represent?
spektrum.de/raetsel/welche-zahlen-verbergen-sich-hinter-den-beiden-fragezeichen/2085006

Puzzles with Eder: What are the side lengths of the cube?: Dice numbers - | what is the natural number a?
spektrum.de/raetsel/welche-seitenlaenge-hat-der-wuerfel/2085072

Puzzle with Eder: What do these numbers have in common?: What distinguishes these number triplets?
spektrum.de/raetsel/welche-gemeinsamkeit-haben-diese-zahlen/2085237

Puzzle with Eder: Which numbers are we looking for?: Tricky sequence of numbers - | which numbers are we looking for?
spektrum.de/raetsel/welche-zahlen-sind-gesucht/2085291

Puzzles with Eder: What will this number become?: Number Transformation - | What will this number become?
spektrum.de/raetsel/worin-verwandelt-sich-diese-zahl/2085318

Puzzle with Eder: What do these numbers have in common?: Looking for commonality - | what property is it?
spektrum.de/raetsel/was-haben-diese-zahlen-gemeinsam/2085345

Puzzles with Eder: How can this area be calculated?: How big is the area of the yellow triangle?
spektrum.de/raetsel/wie-laesst-sich-diese-flaeche-berechnen/2087277

Puzzle with Eder: Is this statement true?: Just an assertion?
spektrum.de/raetsel/stimmt-diese-aussage/2087307

Puzzles with Eder: How can the percentage be determined?: What proportion of the property does the swimming pool occupy?
spektrum.de/raetsel/wie-laesst-sich-der-prozentuale-anteil-bestimmen/2087382

Puzzles with Eder: Which characteristic are we looking for?: 77 and more - | what characterizes these eleven numbers?
spektrum.de/raetsel/welche-eigenschaft-wird-gesucht/2087454

Puzzle with Eder: What special thing do these numbers have in common?: What distinguishes these 15 three-digit natural numbers?
spektrum.de/raetsel/welche-besondere-gemeinsamkeit-haben-diese-zahlen/2239247

Puzzle with Eder: What is the area of this triangle?: How can the area of the blue triangle be calculated?
spektrum.de/raetsel/welche-flaeche-hat-dieses-dreieck/2261848

Puzzle with Eder: Which number is hidden behind the question mark?: Which number is missing from this table of numbers?
spektrum.de/raetsel/welche-zahl-versteckt-sich-hinter-dem-fragezeichen/2230530

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