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Graphical Approach to solve multi-step problems A farmer has 700 goats and sheep. After he sells 400 sheep and ¾ of his goat, he has equal number of goats.

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Presentation on theme: "Graphical Approach to solve multi-step problems A farmer has 700 goats and sheep. After he sells 400 sheep and ¾ of his goat, he has equal number of goats."— Presentation transcript:

1 Graphical Approach to solve multi-step problems A farmer has 700 goats and sheep. After he sells 400 sheep and ¾ of his goat, he has equal number of goats and sheep. How many more sheep than goats he had before they were sold? Based on 70 Must Know Word Problems, Level 4 (Singapore: Singapore Asian Ltd., 2009)

2 Graphical Approach to solve multi-step problems A farmer has 700 goats and sheep. After he sells 400 sheep and ¾ of his goat, he has equal number of goats and sheep. How many more sheep than goats he had before they were sold? Based on 70 Must Know Word Problems, Level 4 (Singapore: Singapore Asian Ltd., 2009)

3 Graphical Approach to solve multi-step problems 1) Total number of goats and sheep: GoatsSheep 2) Sells 400 sheep and ¾ of his goats. ?400

4 Graphical Approach to solve multi-step problems 1) Total number of goats and sheep: GoatsSheep 2) Sells 400 sheep and ¾ of his goats. 400? 3) Now he has equal number of goats and sheep.

5 Graphical Approach to solve multi-step problems 1) Total number of goats and sheep: GoatsSheep 2) Sells 400 sheep and ¾ of his goats. 400? 300 3) Now he has equal number of goats and sheep. ????

6 Graphical Approach to solve multi-step problems 1) Total number of goats and sheep: GoatsSheep 2) Sells 400 sheep and ¾ of his goats ) Now he has equal number of goats and sheep.

7 Graphical Approach to solve multi-step problems 700 GoatsSheep 2) Sells 400 sheep and ¾ of his goats ) Number of sheep: 460 3) Now he has equal number of goats and sheep.

8 Graphical Approach to solve multi-step problems 700 GoatsSheep ) Number of sheep: 460 Number of goats: 240 3) Now he has equal number of goats and sheep.

9 Graphical Approach to solve multi-step problems 700 GoatsSheep ) Number of sheep: 460 Number of goats: 240 5) Originally, he had 220 more sheep than goats.

10 Graphical Approach to solve multi-step problems A farmer has 700 goats and sheep. After he sells 400 sheep and ¾ of his goat, he has equal number of goats and sheep. How many more sheep than goats he had before they were sold? Based on 70 Must Know Word Problems, Level 4 (Singapore: Singapore Asian Ltd., 2009) Algebraic approach

11 Graphical Approach to solve multi-step problems Algebraic approach G: Number of goats S: Number of sheep G + S = 700 Sells: ¾ of the goats, and 100 sheep

12 Graphical Approach to solve multi-step problems G + S = 700 Sells: ¾ of the goats, and 400 sheep G = S – Afterwards there are equal number of goats and sheep.

13 Graphical Approach to solve multi-step problems G + S = 700 G = S – Determine S – G

14 Graphical Approach to solve multi-step problems G + S = 700 G = S – G = 4(S – 400), and G = 700 – S, or 700 – S = 4S –1600

15 Graphical Approach to solve multi-step problems G + S = – S = 4S – = 5S, or 460 = S, and G = 700 – S = – 460 = 240

16 Graphical Approach to solve multi-step problems S = 460, and G = 240, thus S – G = 220

17 Graphical Approach to solve multi-step problems Graphical Algebraic approach Relies on the know- ledge of multiplication division and fraction of a whole number. Accessible to the students in 4 th grade. Requires the knowledge of Algebra: Two equations and two unknowns. Acces- sible to the students in 7 th grade.


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