Sensational Subtraction

  Sensational Subtraction

We are learning to solve subtraction problems using decimal numbers.

List 3  prime numbers: 2,7,13 

List the factors of 24: 1,4, 6, 12.

List the common factors of 24 and 48: 1, 2, 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

$0.30 x 600 = 180 

$0.30 x 50 = 15

 

600 + 50 = 650 

$180.00 + $15.0 = $195.0  

 How much does he have left? 

$1000 - ? =  $195.0

? = $805.0

Next he spends $167.70 on rulers and protractors

How much is left now?

637.30

 $167.70 + ? = $805.0

? = 637.30 

Then he purchases 5 text books, which cost $26.50 each. The 5 textbooks cost:  132.50

132.50 + ? = 637.30 

? = 504.80

 How much does he have left?

132.50 + ? = 637.30 

? = 504.80

Finally he spends $6.70 on stickers.

 How much does he have left?

6.70 + ? = 504.80

? = 498.10 

4 - 0.768 = 3.232