# Teaching Notes

Understanding Number and Number Notation

This week we are focusing on the theme of Understanding Number and Number Notation, concentrating on decimals. Decimals play an important part in everyday life, particularly in relation to the use of money. It is so important that we understand decimal notation and can read, write and order decimals.

Reading and Writing Decimal Numbers - Monday

A decimal is a way of writing a number that is not whole.

Decimal numbers are 'in between' numbers. For example, 10.4 is in between the numbers 10 and 11. It is more than 10, but less than 11.

Take care when reading the values of decimal numbers.

4.2 means 4 and 2 tenths.

4.20 means 4 and 2 tenths and 0 one-hundredths. The last zero does not need to be there.

4.02 means 4 and 0 tenths and 2 one-hundredths.

Explore the link below for more on decimals.

https://www.bbc.co.uk/bitesize/topics/zsjqtfr/articles/zsbd7p3

Ordering Decimals - Tuesday and Wednesday

For a fun explanation of ordering decimals, click on the YouTube link to the ordering decimals song.
https://youtu.be/68TBZRfaKnA

When ordering numbers, always compare the left digits first.

For example, which is greater 2.301 or 2.32?

Both numbers have two units and three tenths, but 2.301 has no hundredths, whereas 2.32 has two hundredths. Therefore, 2.32 is greater than 2.301. If we were ordering these from largest to smallest we would write 2.32 first and then 2.301.

Remember if you are asked to order in ascending order you write the numbers from smallest to largest.

If you are asked to write in descending order, you write the numbers from largest to smallest.

Explore the link below for more on ordering decimals.

https://www.mathgoodies.com/lessons/decimals/order

Exploring Decimals, Fractions and Percentages - Thursday and Friday

Decimals share a close relationship with fractions and percentages, once you understand the relationship it helps with your overall number work. You can easily convert from one to another and apply your knowledge across word problems. For example, if you are asked to find 0.5 of a number you would know you are finding 1/2 or 50%. Check out the two links below for more about fractions, decimals and percentages.

https://www.mathsisfun.com/decimal-fraction-percentage.html

Have a go at playing this memory fractions, percentages and decimals game before completing your independent work. Just click on the link below.

https://nrich.maths.org/1249

Use the conversion table below to help with your independent work.

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