Year 2

We can explain the value of each digit in a two-digit number.
We can partition numbers in different ways.

Year 2 Unit 11

What we are learning:

• We have already looked at explaining the value of each digit in a two-digit number and now we are going to focus on partitioning numbers in different ways – this is very important in developing your child’s confidence and competence in using numbers and calculating
• To be able to partition numbers it is really important that your child can already recognize, read, say and write two-digit and three-digit numbers.
• It is vital that your child has had opportunities to count orally in order from different starting points and to count large amount of objects. They need to be confident at counting. They need to have a ‘sense’ of the size of numbers
• This is now about looking deeper into the patterns and rules in our number
  system. 
• The language of place value is really important – don’t be tempted to ‘make it simpler’ by inventing words of your own.
• Using objects will help your child’s understanding
• Remember that whilst this may seem fairly straight forward there are many ‘tricky’ ones.
• When your child is ready it is important to begin to look at three-digit numbers as well.

ACTIVITY 1: PARTITIONING NUMBERS INTO TENS AND UNITS

ACTIVITY 2: FUN WAYS TO PARTITION NUMBERS

ACTIVITY 3: MORE FUN WAYS TO PARTITION NUMBERS

Activities you can do at home:

Activity 1 Partitioning numbers into tens and units
Write a two digit number and ask your child to partition it into the value of each digit – so for 58 they would write 50 + 8. Now ask them to partition the same number again in a different way –so this could be 40 + 10 + 8 or 30 + 20
+ 8 or 20 + 10 + 10 +10 + 8 or 50 + 4 + 4 or 50 + 6 + 2 or 30 + 10 + 10 + 3 + 3 + 2 etc. Write the number in the middle of a piece of paper and around it write the different ways of partitioning the number. The next day, look at all the different ways of partitioning you have already found and add more ways.
Can you find a different way of partitioning the numbers?
Try this with three-digit numbers. Remember to build this up slowly like we did with the two-digit numbers.

Activity 2 and 3 Fun ways to partition numbers
If we start with a number, e.g. 56 we can partition it in different ways. They might start by saying 50 + 6 which is correct. The challenge then is to find other ways to partition 56. For example you split it into 20+30+6 and so on.
Try writing the target number in the centre of a piece of paper and seeing how many different ways you can find to partition it.
If your child becomes very confident with this try a starting number that has hundreds, tens and units in it.

Good questions to ask:

How can you partition this two/three digit number?
If I combine 70 and 3 what number do I have?
If I combine 100, 60 and 9 what number do I have?

If your child:

Gets confused about the value of digits in ‘tricky’ numbers, e.g. 55
Use objects, e.g. straws to build the number and compare the five tens with
the five units to see the difference