Prime testing, GCD, LCM, and divisibility rules from 2 through 12. 30 progressive levels.
Why this matters
Primes support cryptography, GCD/LCM solve scheduling problems, and divisibility rules simplify fractions quickly.
Levels Cleared
0%
Group 1
Count Down
Score 100 in 57s
Primes (<= 30)
Reach Target
Reach 150 pts in 58s
Primes (<= 50)
Last Problems
Last for 18 problems
Primes (50-200)
Last Time
Last for 43 seconds
Primes (100-500)
Beat The Clock
Get 12 correct in 57s
Divisibility intro (2, 3, 5)
Group 2
Count Down
Score 115 in 54s
Divisibility (2-6)
Reach Target
Reach 173 pts in 56s
Divisibility (3-9)
Last Problems
Last for 21 problems
Divisibility (all small rules)
Last Time
Last for 41 seconds
GCD (small, <= 30)
Beat The Clock
Get 14 correct in 54s
GCD (<= 50)
Group 3
Count Down
Score 130 in 51s
GCD (<= 80)
Reach Target
Reach 195 pts in 54s
GCD (<= 120)
Last Problems
Last for 24 problems
GCD (<= 200)
Last Time
Last for 39 seconds
GCD (<= 300)
Beat The Clock
Get 16 correct in 51s
GCD mastery (<= 500)
Group 4
Count Down
Score 145 in 48s
LCM (<= 12)
Reach Target
Reach 218 pts in 52s
LCM (<= 18)
Last Problems
Last for 27 problems
LCM (<= 25)
Last Time
Last for 37 seconds
LCM (<= 35)
Beat The Clock
Get 18 correct in 48s
LCM (<= 50)
Group 5
Count Down
Score 160 in 45s
LCM (<= 60)
Reach Target
Reach 240 pts in 50s
LCM mastery (<= 80)
Last Problems
Last for 30 problems
Rules - small (2, 3, 4, 5)
Last Time
Last for 35 seconds
Rules - even (4, 6, 8)
Beat The Clock
Get 20 correct in 45s
Rules - digit-sum (3, 9)
Group 6
Count Down
Score 175 in 42s
Rule for 7
Reach Target
Reach 263 pts in 48s
Rule for 11
Last Problems
Last for 33 problems
Rule for 12
Last Time
Last for 33 seconds
Rules - all (small N)
Beat The Clock
Get 22 correct in 42s
Rules mastery (4-digit N)