Filter by difficulty level  

The Problem of Ages Challenge 5
How much money? Challenge 6
What's the number? Challenge 13
Lady's Age Challenge 14
Wine Bottles Challenge 16
Pie Cutting Challenge 23
How many pages does the book have? Challenge 28
Possible values for x? Challenge 29
The Number 1234512345123451234512345 Challenge 30
Find 2 3digit numbers… Challenge 31
Next Sequence Number Challenge 36
Who did not pay the entrance? Challenge 37
What percentage of boys? Challenge 41
Solve the equation Challenge 42
Row of Bottles Continues after advertising Challenge 44
Find the heaviest ball Challenge 45
Spider's Web Challenge 46
The diehard frog Challenge 47
Sugar Tea Bags Challenge 48
Share the apples among the children Challenge 49
Balls in the box Challenge 51
Discover the Age of Children Challenge 52
Mom, kids, and potatoes Challenge 53
The Super Fly Challenge 54
How much is the product worth? Challenge 55
The Bridge Challenge 58
Pilgrim Challenge 60
The Chocolate Company Challenge 61
Ladder on the ship Challenge 63
Octagenarian and his greatgrandson 1 2 3 4 Next >>
Do you know any mathematical challenges that could be published here? Send for us!
<