During the third hour after midnight the hands on a clock point in
the same direction (so one hand is over the top of the other). At
what time, to the nearest second, does this happen?
This article for teachers suggests ideas for activities built around 10 and 2010.
Which times on a digital clock have a line of symmetry? Which look
the same upside-down? You might like to try this investigation and
Use the number weights to find different ways of balancing the equaliser.
Twizzle, a female giraffe, needs transporting to another zoo. Which
route will give the fastest journey?
These sixteen children are standing in four lines of four, one behind the other. They are each holding a card with a number on it. Can you work out the missing numbers?
Investigate the different distances of these car journeys and find
out how long they take.
On Planet Plex, there are only 6 hours in the day. Can you answer
these questions about how Arog the Alien spends his day?
A lady has a steel rod and a wooden pole and she knows the length
of each. How can she measure out an 8 unit piece of pole?
Investigate what happens when you add house numbers along a street
in different ways.
There are nasty versions of this dice game but we'll start with the nice ones...
As you come down the ladders of the Tall Tower you collect useful spells. Which way should you go to collect the most spells?
Fill in the numbers to make the sum of each row, column and
diagonal equal to 15.
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?
An environment which simulates working with Cuisenaire rods.
Find the next number in this pattern: 3, 7, 19, 55 ...
Use these head, body and leg pieces to make Robot Monsters which are different heights.
Can you hang weights in the right place to make the equaliser
Can you each work out the number on your card? What do you notice?
How could you sort the cards?
In this investigation, you are challenged to make mobile phone
numbers which are easy to remember. What happens if you make a
sequence adding 2 each time?
Bernard Bagnall recommends some primary school problems which use
numbers from the environment around us, from clocks to house
In this 100 square, look at the green square which contains the numbers 2, 3, 12 and 13. What is the sum of the numbers that are diagonally opposite each other? What do you notice?
Susie took cherries out of a bowl by following a certain pattern.
How many cherries had there been in the bowl to start with if she
was left with 14 single ones?
Put operations signs between the numbers 3 4 5 6 to make the highest possible number and lowest possible number.
Complete these two jigsaws then put one on top of the other. What
happens when you add the 'touching' numbers? What happens when you
change the position of the jigsaws?
How have the numbers been placed in this Carroll diagram? Which labels would you put on each row and column?
If the numbers 5, 7 and 4 go into this function machine, what
numbers will come out?
Place this "worm" on the 100 square and find the total of the four
squares it covers. Keeping its head in the same place, what other
totals can you make?
Noah saw 12 legs walk by into the Ark. How many creatures did he see?
Can you draw a continuous line through 16 numbers on this grid so
that the total of the numbers you pass through is as high as
In this section from a calendar, put a square box around the 1st,
2nd, 8th and 9th. Add all the pairs of numbers. What do you notice
about the answers?
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?
Use the interactivities to fill in these Carroll diagrams. How do you know where to place the numbers?
There were 22 legs creeping across the web. How many flies? How many spiders?
If you have only four weights, where could you place them in order
to balance this equaliser?
Number problems at primary level that require careful consideration.
On the table there is a pile of oranges and lemons that weighs
exactly one kilogram. Using the information, can you work out how
many lemons there are?
Some Games That May Be Nice or Nasty for an adult and child. Use your knowledge of place value to beat your opponent.
There are three baskets, a brown one, a red one and a pink one, holding a total of 10 eggs. Can you use the information given to find out how many eggs are in each basket?
Woof is a big dog. Yap is a little dog.
Emma has 16 dog biscuits to give to the two dogs.
She gave Woof 4 more biscuits than Yap.
How many biscuits did each dog get?
At the beginning of May Tom put his tomato plant outside. On the same day he sowed a bean in another pot. When will the two be the same height?
Jack's mum bought some candles to use on his birthday cakes and when his sister was born, she used them on her cakes too. Can you use the information to find out when Kate was born?
EWWNP means Exploring Wild and Wonderful Number Patterns Created by Yourself! Investigate what happens if we create number patterns using some simple rules.
Where can you draw a line on a clock face so that the numbers on
both sides have the same total?
Ben’s class were cutting up number tracks. First they cut them into twos and added up the numbers on each piece. What patterns could they see?
Can you find 2 butterflies to go on each flower so that the numbers
on each pair of butterflies adds to the same number as the one on
Can you make a train the same length as Laura's but using three differently coloured rods? Is there only one way of doing it?
Claire thinks she has the most sports cards in her album. "I have
12 pages with 2 cards on each page", says Claire. Ross counts his
cards. "No! I have 3 cards on each of my pages and there are. . . .
These caterpillars have 16 parts. What different shapes do they make if each part lies in the small squares of a 4 by 4 square?
Sam got into an elevator. He went down five floors, up six floors, down seven floors, then got out on the second floor. On what floor did he get on?