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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

Is the circumference of a circle or a square larger?: Circle and square
spektrum.de/raetsel/ist-der-umfang-des-kreises-oder-der-des-quadrates-groesser/2085039

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

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

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

Hemme's mathematical puzzle: How long are the sides?: How can the length of the square sides be determined?
spektrum.de/raetsel/wie-lang-sind-die-seiten/2266685

Puzzle with Eder: What is the last number?: What's behind this episode?
spektrum.de/raetsel/wie-lautet-die-letzte-zahl/2085279

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

Hemme's mathematical puzzle: How can the rectangle be divided?: How can the rectangle be divided with two cuts?
spektrum.de/raetsel/wie-kann-das-rechteck-zerlegt-werden/2266775

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

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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