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Using addition facts to 10

What does commutative mean? 

It doesn't matter which way around you add numbers. The answer will always be the same.  

For example...

1 + 9 = 10 gives the same result as 9 + 1= 10

therefore addition is commutative. 

 

Can you draw a part part whole model using your numbers bonds to 10?

The first one has been done for you. 

 

9 + 1 = 10  

9 + 1 = 10 

 

Challenge-  A fact family is a group of calculations that are created using the same three numbers. We already know the addition calculations, can you now work out the subtraction calculations? For example...

10 - 9 = 1

10 - 1 = 9   

 
 
Adding two 2 digit numbers 

Draw a number line to help you solve the word problems below. 

Remember, start your number line on the largest number and then jump in steps of ten and ones.

WB 16.11.20 

Activity 1

Look at the word problems below. Can you draw number lines to solve the problem?

When we are subtracting, remember to start the number line from the opposite side of the page and count backwards in jumps of 10. 

Activity 2 

I have 48 sweets and I eat 23 of them. How many do I have left?

We could solve this problem by using a tens and ones grid. 

Draw 4 tens and 8 ones. 

Then subtract 23. Therefore,  cross out 2 tens and 3 ones. 

Then count how many tens and ones are left. 

2 tens and 5 ones. 

So my answer is 25. 

 

Now try solving these word problems. 

1. There are 57 people on a bus, 22 get off. How many people are left on the bus? 

2. Tom has 36 apples. He gives 14 to Dan. How many apples does Tom have left?

3. There are 49 bees in a hive. 31 fly away. How many bees are left?

 

Using arrays to solve multiplication calculations- WB 23.11.20

 

An array is an arrangement of rows to help us to work out a multiplication problem. 

For example...

This array shows 2 rows of 4. 

 

Using the worksheet below,  can you draw the array and write the multiplication calculation.

 

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