FOCUS QUESTION
1. Use ratio to compare quantities.
2. Write a ratio to compare the numbers of items in two sets or two parts of a single set.
3. Write a ratio using the formats 1:5, 1 to 5, 1/5.
4. Write equivalent ratios for a given ratio
Students will be asked to differentiate between the concepts ‘Share” and “divide”
Share a group of 18 counters as instructed by teacher. That is, for every 1 counter Pete gets, Harry gets 2. Students will answer the questions:
(a) How many did Harry get?
(b) How many did Pete get?
I want you to watch this video clip to glean information on RATIO.
Youtube video (Introduction to ratios , ratios,rates and percentage)
(Teacher will pause at intervals to highlight that ratios can be written in three different ways. Eg 2 to 3, 2:3, 2/3)
(Students will revisit the first activity done, and write how the counters were shared in ratio format. That is, 1:2.)
Let's review the concept "equivalent fraction". What do you recall about this?
Ok, there can be equivalent ratios also. Let's read the following chart below.
Now find a ratio equivalent to 1:2 = 6:12
We can also simplify given ratios. Look at the following.
Explain what ratio is and how it can be written.
Tell what is meant by equivalent ratios and provide examples.
Work cooperatively to solve problems on ratio. Eg.
In a bag, there are 5 red marbles, 2 green and 7 black.
(a) What is the ratio of green marbles to red marbles?
(b) What is the ratio of red marbles to green marbles?
(c) Green marbles to the total number of marbles?
1. In a school, there are 60 boys and 40 girls. What is the ratio of girls to boy? What is the ratio of boys to the total number of students?
2. Simplify the following ratios.
(a) 14: 60 (b) 12: 50 (c) 20 : 25
3. Write two ratios that are equivalent to the ones below.
(a) 3:6 (b) 4:10 (c) 3:7
3.
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ReplyDeleteRatio was never one of my favourite topics to teach. You make it look so easy now. Thanks!!!!!!!
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