There are different ways to add and subtract larger, 2-digit, numbers, which we look at and discuss, using resources and our Number Facts knowledge.

Here you can find are demonstrations and fun games to practise and improve your Big Numbers Addition and Subtractions.

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Add        Plus        Together        All together        Sum        Total

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#### 2-Digit Number Add 1-Digit Number Using Dienes

1. Draw the dienes to show the first number. It is best to start with the largest number.
3. Draw the dienes to show the the other number.
4. Add and count all the tens.

6. then add, count on the ones.

## 2 Digit + 1 Digit Using Dienes

Year 1 & 2 - Addition

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#### using Jumps of 1 on a Number Line

1. Draw the number line and write the first number

2. Do single jumps of +1 to add the other, second number.
3. The number you landed on is the answer.

## 2 Digit + 1 Digit Using Number Line Jumps of 1

Year 1 & 2 - Addition

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#### on a Number Line Using Number Bonds Knowledge

1. Draw the number line.
2. Write the starting (largest) number at the start of the line (on the left).

(nearest multiple of 10, i.e. 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, and so on).
4. Write in the jump how many you jumped by.
5. Look at the number you are adding.
6. How many more ones are still left for you need to add? Add these on.
7. The answer is the final number you land on.

## 2 Digit + 1 Digit Using Number Bonds on Number Line

Year 1 & 2 - Addition

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#### 2-Digit Number Add 2-Digit Number Using Dienes

1. Draw the dienes to show the first number

(draw the tens first, then the ones, like in our song).

2. Do the same with the second number in the addition calculation.
3. Count to add all the tens.
4. Keep that number in your head and continue, now continue counting in ones to add on the ones.

## 2 Digit + 2 Digit Using Dienes

Year 1 & 2 - Addition

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Below are a few demonstrations how to use a number line for a method, that we have practised in school and the children had had the opportunities to consolidate in their Homework.

The method by includes:

• then add/subtract the tens of the smaller number,
• followed by adding/subtracting the ones/units of the smaller number.

## 2 Digit + 2 Digit Using Number Line with Number Bonds and Jumps of Ten

Year 1 & 2 - Addition

## Year 2 Maths - Number Line Calculations

In this week's Maths lesson Miss Sainsbury is demonstrating how to use a number line to find the answer to an addition or subtraction number sentence.Can you...

## Year 2: Adding Two 2-Digit Numbers using a Number Line

This video demonstrates how Year 2 at Glenfrome Primary School have been taught to add two 2 digit numbers.

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SUBTRACTION

## Keywords for Subtraction (from Musical Math Vol. 2)

►Stream All HeidiSongs Videos: https://heidisongs.uscreen.io/catalogLearn the different keywords for subtraction with this video from HeidiSongs' Musical Mat...

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#### 1-Digit Number Subtract 1-Digit Using a Number Line

1. Draw a number line.
2. Write the largest number on the right hand side of the line.
3. Write the smallest number on the left hand side of the line.
4. From the largest number jump back by 1.
5. Record/write the number you are now at below.
6. Keep jumping back by 1 until you get to the smallest number.
7. The amount of jumps you did is the answer.

## 1 Digit Number - 1 Digit Number Using Number Line

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#### 2-Digit Number Subtract 1-Digit Number (No Bridging)

1. Draw the dienes to show the FIRST number, which is ALWAYS the LARGEST number.
2. Cross out the same amount of dienes as the number you are subtracting.
3. Count up the amount of dienes you have left.

## 2 Digit - 1 Digit (No Bridging)

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#### Subtraction - Exchanging/Swapping

1. Look at the calculation.
2. Draw the dienes (the sticks of ten and the little ones/units) to show the largest number.
3. Look at the number you are subtracting.
4. Cross out the number of ones dienes.
5. If you run out of ones dienes to cross out then take a stick of ten and exchange/swap it for

ten little ones.

6. Continue to cross these little ones out until you have subtracted all you need to.

## Subtraction Exchanging Dienes

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#### Using Dienes and Number Line

1. Draw a number line.

2. Write the largest number on the right hand side.
3. Look at the number you are subtracting. How many tens an d how many ones does it have?
4. Jump back in tens - the number of tens that the number your are subtracting has.
5. Record/write the number on which you land.
6. Then jump back in ones by the same amount of ones as in the number you are subtracting.
7. The number on which you land is the answer.

## 2 Digit - 2 Digit Using Dienes and Number Line

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Finding the DIFFERENCE

#### (or any other objects/things)

1. Look at the first tower and tick the amount of block it contains.
2. Tick this same amount of blocks on the second tower.
3. Count the amount of block on the large tower that have not been ticked.
4. The number of unticked blocks is the answer.

## Finding Difference Using Towers

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#### Finding the Difference Using a Number Line

1. Look at the largest number and underline it so you do not go past.
2. Circle the smallest number.
3. Starting at the next number, tick all the numbers up to and including the one you need to stop at.
4. Count up the amount of ticks you have.

## Finding Difference Using a Number Line

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WHOLE, PART, PART

#### Finding the Largest Number

1. Look at the numbers underneath the whole box at the top. They are the smaller parts that

add together to make the answer, the whole number (that is also the biggest number).
2. You can draw dienes to show the first number, first part.
(dienes are sticks of tens and little ones)
3. Do the same for the second number, second part.
4. Add all of the tens you have.
5. Add all the ones you have.
6. Add the tens (from step 6) and the ones/units (from step 7) together to get the answer,

the whole number.

## Bar Model to find the Biggest Number

Year 1 & 2 - Addition

#### Finding the Missing Part using Number Bonds to 20

* The biggest box is the Whole and contains the biggest number.
* The two boxes below are the Smaller Parts that add up to make the biggest number above,

the Whole

* You can use your knowledge of Number Bonds for 20 to find the missing part.

1) Think: 15 needs what to make 20?

2) 15 needs 5 to make 20, so the missing number is 5.

* Or you can use a number line to find the missing part, smaller number.

1) Draw a number line and add the part you have (smallest number on the left hand side).
2) Keep adding +1 until you get to the number at the top of the bar model.
3) Count up all the jumps of +1 you have.

## Bar Model Using Number Bonds to 20

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#### Bar Model - Finding the Smaller Part, the missing Number

1. The biggest box contains the whole, biggest number.
2. The two numbers, the two parts below add up to the biggest whole number above.
3. So, to find the missing number, missing part of the whole, we need to subtract the smallest

number we have from the largest number on top.
4. Draw the dienes to show the largest number, part.
5. Cross out the amount of tens that are in the number you are taking away.
6.Cross out the amount of ones in the number you are taking away.
8. Count up the tens and ones dienes you have left. This is your missing number, missing part.

## Bar Model to Find Smallest Number

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#### Finding the Missing Number, Missing Part by Subtraction Using a Number Line and Dienes

1. The whole part, largest number is on top.
2. The missing number below will be less than this because it is only a Part of the Whole

number.
3. Subtract the smaller number, smaller part from the largest whole number.
4. Draw the dienes to show the whole number at the top.
5. Cross out the amount of tens dienes sticks of the number you are subtracting from the

7. Cross out the amount of ones dienes of the number you are subtracting from the ones

8. If you have not got enough ones dienes. Take a tens dienes stick and split it into ten

little ones. Now you will have enough little ones.

## Missing Number Subtraction Using Number Line and Dienes

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More      Find the Missing Number

#### Finding a Missing Number Using a Number Line

1. Look at the calculation you have.
2. On a number line draw the first number.
3. Do jumps of +1 until you get to the answer that's been given in the calculation.
4. The answer is the amount of jumps you did.

## Adding - Finding a Missing Number

Year 1 & 2 - Addition

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