## Split Strategy Addition

Okay 2G the Split Strategy is a tactic we use to add big numbers. If we break the big numbers into smaller numbers it is easier to add them together.

For example, in the question below, 16 + 23, we can split 16 into a 10 and a 6.

We can also split the 23 into a 20 and a 3. We then just add the tens and the ones together.

The tens are 10 + 20 and the ones are 6 + 3. Easy! Just break the big numbers into smaller ones.

We can also split the 23 into a 20 and a 3. We then just add the tens and the ones together.

The tens are 10 + 20 and the ones are 6 + 3. Easy! Just break the big numbers into smaller ones.

Check out Will in this video explaining how to use the Split Strategy. Press the button.

See if you can add these numbers using the split strategy. The answers are on the Maths Answers page.

- 13 + 12
- 15 + 14
- 24 + 13
- 32 + 26
- 23 + 18
- 44 + 36
- 11 + 78
- 63 + 39
- 124 + 132
- 2423 + 3562

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The Compensation strategy

Another cool strategy to learn 2G is the Compensation Strategy. Compensation means giving something back that is taken away. It's a bit like the Split Strategy, but you have to think carefully.

For example if we add 19 and 11 together, we can make the 19 into a 20 by borrowing a 1 from the 11.

If we do that, the 11 becomes a 10. Then it's easy to add 20 and 10 together, to get our answer which is 30. But here's Steven to explain how to do it. Press the button:

See if you can add these numbers together using the Compensation Strategy: The answers are on the Maths Answers page.

1. 18 + 12

2. 29 + 23

3. 48 + 35

4. 67 + 33

5. 89 + 12

1. 18 + 12

2. 29 + 23

3. 48 + 35

4. 67 + 33

5. 89 + 12

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## Friends of 10!

Right 2G we know our Friends of Ten pretty well. 0 + 10, 1 + 9, 2 + 8, 3 + 7, 4 + 6, and 5 + 5. The best thing about Friends of Ten is that they reveal patterns to add much bigger numbers. For example if you know that 6 + 4 = 10 you can see how 60 + 40 = 100 and if you are especially clever you can tell that 400 + 600 = 1000!

Press the button under the picture to play Make 10.

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subtraction

Subtraction is the opposite of addition. Instead of adding we are taking away.

Other words for subtraction are "minus" or "less". To subtract a number just start from the bigger number and count backwards.

Check out this cool Frog subtraction game: Start with the Pro level, it's not too hard. Press!

multiplication

We have been learning about adding groups of things together. Adding groups is called Multiplication. Multiplication is what we mean when we talk about times tables.

If we say 4 times 2 we mean 4 groups of 2 things which equals 8. We often say 4 multiplied by 2 equals 8. The number sentence looks like this:

4 x 2 = 8

We have been singing the 2 times table song. See if you can remember the answers playing the game below. A good place to start is 2 or the 0 - 3 section. After, see if you can do the 3s or even 4s by themselves.

Just click on the button to save the princess!

If we say 4 times 2 we mean 4 groups of 2 things which equals 8. We often say 4 multiplied by 2 equals 8. The number sentence looks like this:

4 x 2 = 8

We have been singing the 2 times table song. See if you can remember the answers playing the game below. A good place to start is 2 or the 0 - 3 section. After, see if you can do the 3s or even 4s by themselves.

Just click on the button to save the princess!

Telling The time

Hey 2G, telling the time is fun. What is time anyway? That's a tricky philosophical question! Check out the cool clock game below. You can change the time however you like. Press on the button.

Here is another time game you might like to play. Click the button.

division

Division means sharing. It is the opposite of multiplication. The division sign looks like this ÷

In the picture above, 2 monkeys are sharing 8 bananas. They have 4 bananas each.

We can say this another way, 8 bananas divided by 2 monkeys equals 4 bananas each.

We can also write the number sentence 8 ÷ 2 = 4

Here is a simple video that explains division. Check it out and practise dividing groups of things at home. See if you can even write a number sentence for the things you divide!

In the picture above, 2 monkeys are sharing 8 bananas. They have 4 bananas each.

We can say this another way, 8 bananas divided by 2 monkeys equals 4 bananas each.

We can also write the number sentence 8 ÷ 2 = 4

Here is a simple video that explains division. Check it out and practise dividing groups of things at home. See if you can even write a number sentence for the things you divide!

Hey here is another cool division game called Fruit Shoot Division. Start at Level 1 and shoot some fruit 2G.

Measurement!

Alright 2G let' s measure! When we find out how long or short something is we are measuring. Measurement is about how wide or thin, how tall or small things are. We have been learning about a small space of measurement called the centimetre. A centimetre is about as long as this little line: ____

They are pretty small, but they are a good unit of measurement to measure small things like a pencil or a rubber. Inside a centimetre there are even 10 littler spaces called millimetres, but we don't have to know about them yet.

We sometimes just use the letters cm when we talk about centimetres because these letters are in the word. This is called an abbreviation. See if you can correctly use centimetres in the game below.

They are pretty small, but they are a good unit of measurement to measure small things like a pencil or a rubber. Inside a centimetre there are even 10 littler spaces called millimetres, but we don't have to know about them yet.

We sometimes just use the letters cm when we talk about centimetres because these letters are in the word. This is called an abbreviation. See if you can correctly use centimetres in the game below.

## Cool Maths GAmes!

Hey 2G everyone wanted Cool Maths Games so here it is!

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