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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

Which numbers are we looking for?: How can the value of a and b be determined?
spektrum.de/raetsel/welche-zahlen-sind-gesucht/2264210

How can this expression be formed?: How can the expression be represented with exactly five fives?
spektrum.de/raetsel/wie-kann-dieser-ausdruck-gebildet-werden/2265273

What height was the cone with its tip?: How high was the cone before it lost its tip?
spektrum.de/raetsel/welche-hoehe-hatte-der-kegel-mit-seiner-spitze/2084820

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

How big is the pond?: How big will the new pond be?
spektrum.de/raetsel/wie-gross-ist-der-teich/2085060

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: 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

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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