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Challenges

Problems worth getting stuck on

A small shelf of curious problems, gathered for every family here. Pick one, sit down together, and if it bites back, June can work through it with your child.

4 of 21 challenges ·

Grade 3

Marbles that change hands

Emma gives some marbles away and the lead shifts -- or does it? Count what the gift does to both sides.

3 problems

Grade 4

Twice his age

A brother is 8 today and the writer will be twice his age in 12 years. The arithmetic is easy; the skill is knowing which year the "twice" belongs to.

1 problem

Grade 5

Six people, six days

Five people earn five thousand in five days, so six people in six days earn... six thousand, right?

1 problem

Grade 7

Two numbers, two clues

Each puzzle gives two facts about hidden numbers and asks one back. The trick is the same every time: turn the clues into shares, solve the picture, then undo the twist.

3 problems