1 
Numbers\Prime factorisation\Prime factorisation 
Easy 
Undergraduate 
Level1 
2 
Numbers/Prime factorisation\Prime factorisation 
Hard 
GCSE 
Foundation 
3 
Numbers\Scientific notation 
Hard 
GCSE 
Intermediate 
4 
Numbers/Surds 
Intermediate 
ALevel 
C1 
5 
Numbers\Surds 
Easy 
Alevel 
C1 
6 
Numbers\Modular arithmetic 
Easy 
Undergraduate 
Level1 
7 
Numbers/Modular airthmetic 
Easy 
Undergradguate 
Foundation 
8 
Numbers\Scientific notation 
Intermediate 
GCSE 
Intermediate 
9 
Numbers\Nondecimal arithmetic\Number bases 
Intermediate 
Undergraduate 
Level1 
10 
Numbers\Nondecimal arithmetic\Binary arithmetic 
Intermediate 
Undergraduate 
Level1 
