Tuesday, 10 March 2020

Serious Subtraction

  Serious Subtraction
This is my maths work for the week.
Mr Burt has $1000 in the maths budget at the start of the year.

He starts by purchasing 650 math books, at $0.30 each. His total spend is: 195, 650x3=1950/3=195

How much does he have left? 805

Next he spends $167.70 on rulers and protractors

800-162.70=642.30

How much is left now?

642.30

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

125+7.50=132.50 642.30-132.50=509.80

How much does he have left?

509.80

Finally he spends $6.70 on stickers.

503.10

How much does he have left?

503.10

What is the best strategy for these problems?

4 - 0.768 =4-0.700=3.300-0.60=3.260-0.8= 3.254

15 - 5.67 =15-5.6=9.4-.07=9.33

2.50 - 1.75 =0.75

5 - 0.654 =4.456

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