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Wednesday 3 March 2021

Sensational Subtraction 3

 Sensational Subtraction

We are learning to solve subtraction problems using decimal numbers.


List 3  prime numbers: 2,3,5


List the factors of 24: 1,2,3,4,6,8,12,24


List the common factors of 24 and 48: 1,2,3,4,6,8,12,24



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: $0.30 x $650 = $195 - $1000 = $805



 How much does he have left? $805


Next he spends $167.70 on rulers and protractors


How much is left now? $167 - $805 =$ 638



Then he purchases 5 text books, which cost $26.50 each. The 5 textbooks cost: 5 x $26.50 = 132.5 - $638 = 505.5


 How much does he have left? $505.5



Finally he spends $6.70 on stickers.


 How much does he have left? $ 6.70 - $505.5 = 498.8



4 - 0.768 = 3.232


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