# Resources tagged with: Addition & subtraction

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### Napier's Bones

##### Age 7 to 11Challenge Level

The Scot, John Napier, invented these strips about 400 years ago to help calculate multiplication and division. Can you work out how to use Napier's bones to find the answer to these multiplications?

### A Numbered Route

##### Age 7 to 11Challenge Level

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 possible?

### Pairs of Numbers

##### Age 5 to 7Challenge Level

If you have ten counters numbered 1 to 10, how many can you put into pairs that add to 10? Which ones do you have to leave out? Why?

### Sorting the Numbers

##### Age 5 to 11Challenge Level

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?

### Even and Odd

##### Age 5 to 7Challenge Level

This activity is best done with a whole class or in a large group. Can you match the cards? What happens when you add pairs of the numbers together?

### Fingers and Hands

##### Age 7 to 11Challenge Level

How would you count the number of fingers in these pictures?

### A Mixed-up Clock

##### Age 7 to 11Challenge Level

There is a clock-face where the numbers have become all mixed up. Can you find out where all the numbers have got to from these ten statements?

### Numbers Numbers Everywhere!

##### Age 5 to 11

Bernard Bagnall recommends some primary school problems which use numbers from the environment around us, from clocks to house numbers.

### Dot Card Games

##### Age 3 to 7

These games devised by Jenni Way use dot cards which will help children see the structure of numbers 1-6 and give them confidence as they begin to add and subtract these numbers.

### Place Value as a Building Block for Developing Fluency in the Calculation Process

##### Age 5 to 11

This article for primary teachers encourages exploration of two fundamental ideas, exchange and 'unitising', which will help children become more fluent when calculating.

### Street Sequences

##### Age 5 to 11Challenge Level

Investigate what happens when you add house numbers along a street in different ways.

### Sumo

##### Age 7 to 11Challenge Level

A number game requiring a strategy.

### Being Resourceful - Primary Number

##### Age 5 to 11Challenge Level

Number problems at primary level that require careful consideration.

### Dotty Six for Two

##### Age 5 to 11Challenge Level

Dotty Six game for an adult and child. Will you be the first to have three sixes in a straight line?

### Number Tracks

##### Age 7 to 11Challenge Level

Benâ€™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?

### Making Pathways

##### Age 7 to 11Challenge Level

Can you find different ways of creating paths using these paving slabs?

### Dotty Six

##### Age 5 to 11Challenge Level

Dotty Six is a simple dice game that you can adapt in many ways.

### Interactive Balance

##### Age 5 to 11Challenge Level

In this simulation of a balance, you can drag numbers and parts of number sentences on to the trays. Have a play!

### Ring a Ring of Numbers

##### Age 5 to 7Challenge Level

Choose four of the numbers from 1 to 9 to put in the squares so that the differences between joined squares are odd.

### Here to There 1 2 3

##### Age 5 to 7Challenge Level

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?

### Robot Monsters

##### Age 5 to 7Challenge Level

Use these head, body and leg pieces to make Robot Monsters which are different heights.

### Odds and Threes

##### Age 7 to 11Challenge Level

A game for 2 people using a pack of cards Turn over 2 cards and try to make an odd number or a multiple of 3.

### Which Symbol?

##### Age 7 to 11Challenge Level

Choose a symbol to put into the number sentence.

### Today's Date - 01/06/2009

##### Age 5 to 11Challenge Level

What do you notice about the date 03.06.09? Or 08.01.09? This challenge invites you to investigate some interesting dates yourself.

### Next Number

##### Age 7 to 11 ShortChallenge Level

Find the next number in this pattern: 3, 7, 19, 55 ...

### Big Dog, Little Dog

##### Age 5 to 7Challenge Level

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?

### Six Is the Sum

##### Age 7 to 11Challenge Level

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

### Nice or Nasty

##### Age 7 to 14Challenge Level

There are nasty versions of this dice game but we'll start with the nice ones...

### Spell by Numbers

##### Age 7 to 11Challenge Level

Can you substitute numbers for the letters in these sums?

### Throw a 100

##### Age 7 to 11Challenge Level

Can you score 100 by throwing rings on this board? Is there more than way to do it?

### Mrs Beeswax

##### Age 5 to 7Challenge Level

In how many ways could Mrs Beeswax put ten coins into her three puddings so that each pudding ended up with at least two coins?

### Sisters and Brothers

##### Age 7 to 11Challenge Level

Cassandra, David and Lachlan are brothers and sisters. They range in age between 1 year and 14 years. Can you figure out their exact ages from the clues?

### It Was 2010!

##### Age 5 to 11Challenge Level

If the answer's 2010, what could the question be?

### Zios and Zepts

##### Age 7 to 11Challenge Level

On the planet Vuv there are two sorts of creatures. The Zios have 3 legs and the Zepts have 7 legs. The great planetary explorer Nico counted 52 legs. How many Zios and how many Zepts were there?

### Machines

##### Age 7 to 11Challenge Level

What is happening at each box in these machines?

### Carrying Cards

##### Age 7 to 11Challenge Level

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?

### Magic Triangle

##### Age 7 to 11Challenge Level

Place the digits 1 to 9 into the circles so that each side of the triangle adds to the same total.

### Sort Them Out (2)

##### Age 7 to 11Challenge Level

Can you each work out the number on your card? What do you notice? How could you sort the cards?

### Pouring the Punch Drink

##### Age 7 to 11Challenge Level

There are 4 jugs which hold 9 litres, 7 litres, 4 litres and 2 litres. Find a way to pour 9 litres of drink from one jug to another until you are left with exactly 3 litres in three of the jugs.

### Function Machines

##### Age 7 to 11Challenge Level

If the numbers 5, 7 and 4 go into this function machine, what numbers will come out?

### Oh! Harry!

##### Age 7 to 11Challenge Level

A group of children are using measuring cylinders but they lose the labels. Can you help relabel them?

### Sort Them Out (1)

##### Age 5 to 7Challenge Level

Can you each work out the number on your card? What do you notice? How could you sort the cards?

### Dart Target

##### Age 7 to 11Challenge Level

This task, written for the National Young Mathematicians' Award 2016, invites you to explore the different combinations of scores that you might get on these dart boards.

### Fair Exchange

##### Age 5 to 7Challenge Level

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?

### On Target

##### Age 7 to 11Challenge Level

You have 5 darts and your target score is 44. How many different ways could you score 44?

### Twizzle's Journey

##### Age 5 to 7Challenge Level

Twizzle, a female giraffe, needs transporting to another zoo. Which route will give the fastest journey?

### Domino Pick

##### Age 5 to 7Challenge Level

Are these domino games fair? Can you explain why or why not?

### Cows and Sheep

##### Age 7 to 11Challenge Level

Use your logical reasoning to work out how many cows and how many sheep there are in each field.

### Being Resilient - Primary Number

##### Age 5 to 11Challenge Level

Number problems at primary level that may require resilience.

### Numbered Cars

##### Age 7 to 11Challenge Level

I was looking at the number plate of a car parked outside. Using my special code S208VBJ adds to 65. Can you crack my code and use it to find out what both of these number plates add up to?