Hen Taid turns 99 today, so we decided to look at what that means in relation to the boys mathematically. Cian started off, showing us what he knew about the number 99.

He knew that after 99 it’s 100. So, 99+1=100 and 100-1=99.

Next, we looked at Cian’s age and how we could use 4 to make 99.

Cian wanted to show us his understanding of what Ioan and Finny had just done.

Next, Ioan looked at his age, compared to Hen Taid’s.

Then, Finny looked at 7 and 99. He definitely got the trickiest number!

Then he spotted another fact he could work out from the answer above.

My favourite bit was the message they wrote.

Using the number 99 meant we soon ran out of resources, so they decided to make a poster instead.

Their finished poster.

## DfES Early Learning Goals (2017)

### Mathematics

#### ELG 11 – Numbers:

Children count reliably with numbers from 1 to 20, place them in order and say which number is one more or one less than a given number.

## DfES National Curriculum (2013)

### Numeracy Year 2 programme of study

#### Number – multiplication and division

• recall and use multiplication and division facts for the 2, 5 and 10 multiplication tables, including recognising odd and even numbers
• calculate mathematical statements for multiplication and division within the multiplication tables and write them using the multiplication (×), division (÷) and equals (=) signs

### Numeracy Year 4 programme of study

#### Number – multiplication and division

• recall multiplication and division facts for multiplication tables up to 12 × 12
• use place value, known and derived facts to multiply and divide mentally
• recognise and use factor pairs and commutativity in mental calculations