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Number Detective

Follow the clues to find the mystery number.

Six Is the Sum

What do the digits in the number fifteen add up to? How many other numbers have digits with the same total but no zeros?

ABC

In the multiplication calculation, some of the digits have been replaced by letters and others by asterisks. Can you reconstruct the original multiplication?

Less Is More

Age 7 to 11
Challenge Level

Here are some examples to help you understand the scoring system:

top row: 24 < 51, bottom row: 33 < 64

Score = 57 (both number sentences are correct)

top row: 45 < 42, bottom row: 33 < 64

Score = 33 (only the bottom number sentence is correct)

 

With the numbers 1-8, it is possible to score more than 117!

The NRICH Project aims to enrich the mathematical experiences of all learners. To support this aim, members of the NRICH team work in a wide range of capacities, including providing professional development for teachers wishing to embed rich mathematical tasks into everyday classroom practice.
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NRICH is part of the family of activities in the Millennium Mathematics Project.