Working systematically

There are 604 NRICH Mathematical resources connected to Working systematically
Cover the tray
problem

Cover the tray

Age
7 to 11
Challenge level
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These practical challenges are all about making a 'tray' and covering it with paper.
Sums and Differences 2
problem

Sums and differences 2

Age
7 to 11
Challenge level
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Find the sum and difference between a pair of two-digit numbers. Now find the sum and difference between the sum and difference! What happens?
Sums and Differences 1
problem

Sums and differences 1

Age
7 to 11
Challenge level
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This challenge focuses on finding the sum and difference of pairs of two-digit numbers.
Coins (2)
problem

Coins (2)

Age
7 to 11
Challenge level
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What is the smallest number of coins needed to make up 12 dollars and 83 cents?