You may also like

Consecutive Numbers

An investigation involving adding and subtracting sets of consecutive numbers. Lots to find out, lots to explore.

Calendar Capers

Choose any three by three square of dates on a calendar page...

Days and Dates

Investigate how you can work out what day of the week your birthday will be on next year, and the year after...

Identical Digit Multiplication

Age 11 to 14 Short
Challenge Level

77 is multiplied by another two-digit number with identical digits.

The third digit of the product, counting from left to right, is a 3.

What is the product?

This problem is adapted from the World Mathematics Championships
You can find more short problems, arranged by curriculum topic, in our short problems collection.