Working systematically

There are 601 NRICH Mathematical resources connected to Working systematically
Parallelogram It
problem
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Parallelogram It

Age
11 to 16
Challenge level
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Players take it in turns to choose a dot on the grid. The winner is the first to have four dots that can be joined to form a parallelogram.

5 by 5 Mathdokus
problem
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5 by 5 Mathdokus

Age
7 to 16
Challenge level
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Can you use the clues to complete these 5 by 5 Mathematical Sudokus?
4 by 4 Mathdokus
problem
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4 by 4 Mathdokus

Age
7 to 14
Challenge level
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Can you use the clues to complete these 4 by 4 Mathematical Sudokus?
Are you well Balanced?
problem
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Are you well Balanced?

Age
5 to 7
Challenge level
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Can you work out how to make each side of this balance equally balanced? You can put more than one weight on a hook.
Fruity Pairs
problem
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Fruity Pairs

Age
5 to 7
Challenge level
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Which two items of fruit could Kate and Sam choose? Can you order the prices from lowest to highest?

The Number Jumbler
problem
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The Number Jumbler

Age
7 to 14
Challenge level
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The Number Jumbler can always work out your chosen symbol. Can you work out how?
Tables Teaser
problem
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Tables Teaser

Age
5 to 7
Challenge level
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How will you work out which numbers have been used to create this multiplication square?
Different Deductions
problem
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Different Deductions

Age
7 to 11
Challenge level
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There are lots of different methods to find out what the shapes are worth - how many can you find?

Fruity Totals
problem
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Fruity Totals

Age
7 to 16
Challenge level
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In this interactivity each fruit has a hidden value. Can you deduce what each one is worth?

Rolling that cube
problem
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Rolling that cube

Age
5 to 11
Challenge level
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My dice has inky marks on each face. Can you find the route it has taken? What does each face look like?