Download presentation

Presentation is loading. Please wait.

Published byMaude Johnston Modified about 1 year ago

1
Mathematics Curriculum Centre Rachel went to the supermarket. She bought some fruit for herself and for her neighbour. However, she forgot to ask for separate bills!

2
Mathematics Curriculum Centre When Rachel checked the price labels on the fruit, she could not read them! - = - _= cents

3
Mathematics Curriculum Centre She knew that she had bought 5 apples and 5 bananas for 90 cents but needed to know the price of each so that she could charge her neighbour accordingly. WW Supermarket 5 apples 5 bananas TOTAL Lm0.90

4
Mathematics Curriculum Centre Luckily, Rachel found yesterday’s bill. 70 cents for 5 apples and 3 bananas. WW Supermarket 5 apples 3 bananas TOTAL Lm0.70 She was charged

5
Mathematics Curriculum Centre Rachel considered herself lucky because she realised that she now knew how to work out the price of an apple and a banana!

6
Mathematics Curriculum Centre Do ? you

7
Mathematics Curriculum Centre WW Supermarket 5 apples 5 bananas TOTAL Lm0.90 Today’s bill WW Supermarket 5 apples 3 bananas TOTAL Lm0.70 Yesterday’s bill

8
Mathematics Curriculum Centre This is what Rachel did. She wrote cents on each apple price label. a

9
Mathematics Curriculum Centre and cents on each banana b price label.

10
Mathematics Curriculum Centre a cents b cents 5 ( a cents) + 5( b cents) = 90 cents

11
Mathematics Curriculum Centre Similarly, yesterday’s bill would be… 5 ( a cents) + 3( b cents) = 70 cents 5 ( a cents) + 5( b cents) = 90 cents In short… 5 a + 5 b = 90 5 a + 3 b = 70

12
Mathematics Curriculum Centre 5 a + 5 b = 90 5 a + 3 b = 70

13
Mathematics Curriculum Centre

14
5 a + 5 b = 90 5 a + 3 b = 70 She subtracted the bills!! 2 b = 20 b = 10 b cents is 10 cents

15
Mathematics Curriculum Centre b cents is 10 cents, then… 5 a + 5 b = 90 As… is… 5 a + 5 (10) = 90 5 a + 50 = 90 5 a = 40 a = 8 a cents is 8 cents

16
Mathematics Curriculum Centre Now Rachel can charge her neighbour because she found out that an apple costs 8 cents and a banana costs 10 cents!

17
Mathematics Curriculum Centre I want to see the solutions again... I want to see the whole story again…

Similar presentations

© 2016 SlidePlayer.com Inc.

All rights reserved.

Ads by Google