Sensational Subtraction

 Sensational Subtraction

We are learning to solve subtraction problems using decimal numbers.


List 3  prime numbers: 1 5 7


List the factors of 24: 1 2 4 6 8 12 24


List the common factors of 24 and 48:


2 4 6 8 12


Mr Burt has $1000 in the maths budget at the start of the year.


He starts by purchasing 650 maths books, at $0.30 each. His total spend is: $195


 How much does he have left? 455


Next he spends $167.70 on rulers and protractors


How much is left now? $287.30


Then he purchases 5 text books, which cost $26.50 each. The 5 textbooks cost:  


 How much does he have left? 


Finally he spends $6.70 on stickers.


 How much does he have left?


4 – 0.768 = 4.232.


Number Visuals

Here are our Number multiples.

We coloured the multiples of 3 green which were triangles, The multiples of 5 which were stars that we coloured yellow, The circles that were all odd Numbers and the squares that were in the multiples of four were squares which were coloured light blue.

We coloured the prime numbers pink because they can only be divided by themselves and one.