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Problems unlock one after another, from simple all the way to genius. Every one you solve adds XP.

1,198 problems
9 difficulty levels
+5 to +405 XP per problem

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Showing 97–144 of 1,198

1.97Arithmetic
Locked
Brackets and the order of operations
Difficulty 1 of 9+5 XP
1.98Fractions
Locked
A difference of mixed numbers
Difficulty 1 of 9+5 XP
1.99Algebra
Locked
A thermometer from morning to evening
Difficulty 1 of 9+5 XP
1.100Geometry
Locked
Mesh around a garden
Difficulty 1 of 9+5 XP
1.101Arithmetic
Locked
Notebooks, pens and change
Difficulty 1 of 9+5 XP
1.102Fractions
Locked
A sum divided by a mixed number
Difficulty 1 of 9+5 XP
1.103Equations
Locked
A bracket on the left-hand side
Difficulty 1 of 9+5 XP
1.104Geometry
Locked
The third angle of a triangle
Difficulty 1 of 9+5 XP
1.105Logic
Locked
An ice hockey league
Difficulty 1 of 9+5 XP
1.106Fractions
Locked
Martin’s walking
Difficulty 1 of 9+5 XP
1.107Algebra
Locked
Substituting a negative number
Difficulty 1 of 9+5 XP
1.108Geometry
Locked
A height from the area
Difficulty 1 of 9+5 XP
1.109Arithmetic
Locked
The factors of 360
Difficulty 1 of 9+5 XP
1.110Fractions
Locked
Pancakes for more guests
Difficulty 1 of 9+5 XP
1.111Equations
Locked
Blocks on the scales
Difficulty 1 of 9+5 XP
1.112Geometry
Locked
Water in an aquarium
Difficulty 1 of 9+5 XP
1.113Arithmetic
Locked
A cyclist on a trip
Difficulty 1 of 9+5 XP
1.114Fractions
Locked
Girls with glasses
Difficulty 1 of 9+5 XP
1.115Algebra
Locked
Squares made of matchsticks
Difficulty 1 of 9+5 XP
1.116Geometry
Locked
A floor in decimetres
Difficulty 1 of 9+5 XP
1.117Arithmetic
Locked
Two bus lines
Difficulty 1 of 9+5 XP
1.118Fractions
Locked
Siblings and a ratio
Difficulty 1 of 9+5 XP
1.119Equations
Locked
A quarter and a half of a secret number
Difficulty 1 of 9+5 XP
1.120Geometry
Locked
A hike by the map
Difficulty 1 of 9+5 XP
1.121Arithmetic
Locked
The night train
Difficulty 1 of 9+5 XP
1.122Fractions
Locked
The largest of four
Difficulty 1 of 9+5 XP
1.123Arithmetic
Locked
I am thinking of a number
Difficulty 1 of 9+5 XP
1.124Fractions
Locked
A book and the cinema
Difficulty 1 of 9+5 XP
1.125Algebra
Locked
Simplify and substitute
Difficulty 1 of 9+5 XP
1.126Geometry
Locked
Two intersecting lines
Difficulty 1 of 9+5 XP
1.127Arithmetic
Locked
How much of the price is tax
Difficulty 1 of 9+5 XP
1.128Fractions
Locked
Peter’s afternoon
Difficulty 1 of 9+5 XP
1.129Equations
Locked
Three even numbers in a row
Difficulty 1 of 9+5 XP
1.130Geometry
Locked
The other height of a parallelogram
Difficulty 1 of 9+5 XP
1.131Arithmetic
Locked
The date in 25 days
Difficulty 1 of 9+5 XP
1.132Fractions
Locked
The fraction in the middle
Difficulty 1 of 9+5 XP
1.133Algebra
Locked
A lift below ground
Difficulty 1 of 9+5 XP
1.134Geometry
Locked
A garden without a corner
Difficulty 1 of 9+5 XP
1.135Arithmetic
Locked
Tiles as large as possible
Difficulty 1 of 9+5 XP
1.136Fractions
Locked
Petrol for a trip
Difficulty 1 of 9+5 XP
1.137Equations
Locked
Triangle sides from the perimeter
Difficulty 1 of 9+5 XP
1.138Geometry
Locked
Tiles for a bathroom
Difficulty 1 of 9+5 XP
1.139Logic
Locked
The finishing order
Difficulty 1 of 9+5 XP
1.140Fractions
Locked
A bill with a tip
Difficulty 1 of 9+5 XP
1.141Algebra
Locked
The missing reading
Difficulty 1 of 9+5 XP
1.142Geometry
Locked
Fence posts
Difficulty 1 of 9+5 XP
1.143Arithmetic
Locked
Missing digits
Difficulty 1 of 9+5 XP
1.144Fractions
Locked
A fence and extra help
Difficulty 1 of 9+5 XP

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All problems

Brackets and the order of operations

A difference of mixed numbers

A thermometer from morning to evening

Mesh around a garden

Notebooks, pens and change

A sum divided by a mixed number

A bracket on the left-hand side

The third angle of a triangle

An ice hockey league

Martin’s walking

Substituting a negative number

A height from the area

The factors of 360

Pancakes for more guests

Blocks on the scales

Water in an aquarium

A cyclist on a trip

Girls with glasses

Squares made of matchsticks

A floor in decimetres

Two bus lines

Siblings and a ratio

A quarter and a half of a secret number

A hike by the map

The night train

The largest of four

I am thinking of a number

A book and the cinema

Simplify and substitute

Two intersecting lines

How much of the price is tax

Peter’s afternoon

Three even numbers in a row

The other height of a parallelogram

The date in 25 days

The fraction in the middle

A lift below ground

A garden without a corner

Tiles as large as possible

Petrol for a trip

Triangle sides from the perimeter

Tiles for a bathroom

The finishing order

A bill with a tip

The missing reading

Fence posts

Missing digits

A fence and extra help