Comparing and ordering numbers

There are 87 NRICH Mathematical resources connected to Comparing and ordering numbers
Fair Exchange
problem

Fair exchange

Age
5 to 7
Challenge level
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In your bank, you have three types of coins. The number of spots shows how much they are worth. Can you choose coins to exchange with the groups given to make the same total?
Here to There 1 2 3
problem

Here to there 1 2 3

Age
5 to 7
Challenge level
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Move from the START to the FINISH by moving across or down to the next square. Can you find a route to make these totals?
The Thousands Game
problem

The thousands game

Age
7 to 11
Challenge level
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Each child in Class 3 took four numbers out of the bag. Who had made the highest even number?
Pros and Cons
problem

Pros and cons

Age
14 to 16
Challenge level
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If p is a positive integer and q is a negative integer, which of these expressions is the greatest?
Greetings
problem

Greetings

Age
11 to 14
Challenge level
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From a group of any 4 students in a class of 30, each has exchanged Christmas cards with the other three. Show that some students have exchanged cards with all the other students in the class. How many such students are there?
Twizzle's Journey
problem

Twizzle's journey

Age
5 to 7
Challenge level
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Twizzle, a female giraffe, needs transporting to another zoo. Which route will give the fastest journey?
Sets of Four Numbers
problem

Sets of four numbers

Age
7 to 11
Challenge level
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There are ten children in Becky's group. Can you find a set of numbers for each of them? Are there any other sets?
Rachel's Problem
problem

Rachel's problem

Age
14 to 16
Challenge level
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Is it true that $99^n$ has 2n digits and $999^n$ has 3n digits? Investigate!
Writ large
problem

Writ large

Age
11 to 14
Challenge level
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Suppose you had to begin the never ending task of writing out the natural numbers: 1, 2, 3, 4, 5.... and so on. What would be the 1000th digit you would write down.
17s and 23s
problem

17s and 23s

Age
11 to 14
Challenge level
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Can you form this 2010-digit number...