Your Solutions - Stage 3 & 4

Cryptarithms

Stage: 3 Challenge Level: Challenge Level:1

Can you crack these cryptarithms?

Impossibilities

Stage: 3 Challenge Level: Challenge Level:2 Challenge Level:2

Just because a problem is impossible doesn't mean it's difficult...

Add to 200

Stage: 3 Challenge Level: Challenge Level:1

By selecting digits for an addition grid, what targets can you make?

Forwards Add Backwards

Stage: 3 Challenge Level: Challenge Level:1

What happens when you add a three digit number to its reverse?

Overlaps

Stage: 3 Challenge Level: Challenge Level:2 Challenge Level:2

Can you find ways to put numbers in the overlaps so the rings have equal totals?

Combining Lengths

Stage: 3 and 4

How many different lengths is it possible to measure with a set of three rods?

Going to the Cinema

Stage: 3 and 4

A cinema has 100 seats. Is it possible to fill every seat and take exactly £100?

You Can't Make an Omelette...

Stage: 3 and 4

Can you devise the most efficient strategy for finding the highest floor from which you can drop an egg safely?

Climbing the Stairs

Stage: 3 and 4

In how many ways can I get upstairs?