Understanding Equivalent Ratios and Solving Ratio Problems
Delve into the concept of equivalent ratios and learn how to solve ratio problems step by step. Explore methods for listing equivalent ratios, simplifying ratios, and applying ratios to real-world scenarios. Enhance your skills in working with ratios by practicing on whiteboards and in books. Discover how listing equivalent ratios can help in solving complex problems, such as determining initial quantities based on ratio changes.
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? ? = 2:3 ? ? = 3:4 What is ? ?? ? ? = 2 4
Listing Equivalent Ratios Method ? ? = 2:3 ? ? = 6:1 ?:? 2 3 4 6 6 8 ?:? 6 1 12 2 18 3 What is ? ? ? ? ? = 4 1
Listing Equivalent Ratios Method ?:? 1 2 2 4 3 6 ?:? 3 2 6 4 9 6 ? ? = 1:2 ? ? = 3:2 What is ? ?? ? ? = 3 4
Working with more than one ratio On your whiteboards: ?: ? = 3: 4 ??? ?: ? ?? 2: 9 ? ?? ?? ? ? ????? ?? ?: ? ?? ??? ???????? ?????
On your whiteboards: ?: ? = 3:3 ??? ?: ? ?? 2: 9 ? ?? ?? ? ? ????? ?? ?:? ?? ??? ???????? ?????
On your whiteboards: ?: ? = 3:5 ??? ?: ? ?? 2: 9 ? ?? ?? ? ? ????? ?? ?:? ?? ??? ???????? ?????
In your books Write the ratios in simplest form
Mark and correct your work ?:? = 27 28 ?:? = 55 56 ?:? = 35 36 Third of a lolly for one bar Two chews per lolly
Listing equivalent ratios can also help us solve further problems. Try this problem: Alice and Bert have some sweets in the ratio 7 : 3 Alice gives 3 sweets to Bert and now the ratio is 5 : 3. How many sweets did Alice have initially?
Alice and Bert have some sweets in the ratio 7 : 3 Alice gives 3 sweets to Bert and now the ratio is 5 : 3. How many sweets did Alice have initially? Before Alice Bert After Alice Bert 7 5 3 3 4 6 14 6 10 6 21 9 15 9 28 12 20 12 35 15 25 15 42 18 30 18 If Alice had 7 sweets and gave Bert 3 what would the ratio afterwards be?
Alice and Bert have some sweets in the ratio 7 : 3 Alice gives 3 sweets to Bert and now the ratio is 5 : 3. How many sweets did Alice have initially? Before Alice Bert After Alice Bert 11 9 7 5 3 3 14 6 10 6 21 9 15 9 28 12 20 12 35 15 25 15 42 18 30 18 If Alice had 14 sweets and gave Bert 3 what would the ratio afterwards be?
Alice and Bert have some sweets in the ratio 7 : 3 Alice gives 3 sweets to Bert and now the ratio is 5 : 3. How many sweets did Alice have initially? Before Alice Bert After Alice Bert 7 5 18 12 3 3 14 6 10 6 21 9 15 9 28 12 20 12 35 15 25 15 42 18 30 18 If Alice had 21 sweets and gave Bert 3 what would the ratio afterwards be?
Alice and Bert have some sweets in the ratio 7 : 3 Alice gives 3 sweets to Bert and now the ratio is 5 : 3. How many sweets did Alice have initially? Before Alice Bert After Alice Bert 7 5 25 15 3 3 14 6 10 6 21 9 15 9 28 12 20 12 35 15 25 15 42 18 30 18 If Alice had 28 sweets and gave Bert 3 what would the ratio afterwards be?
Alice and Bert have some sweets in the ratio 7 : 3 Alice gives 3 sweets to Bert and now the ratio is 5 : 3. How many sweets did Alice have initially? Before Alice Bert After Alice Bert 7 5 3 3 14 6 10 6 21 9 15 9 28 12 20 12 35 15 25 15 42 18 30 18 Alice had 28 sweets initially
Further Problems Jan and Kim own numbers of marbles that are the ratio 5 : 6 The ratio of red to blue beads in a bag is 1 : 4 5 red beads are added to the bag so that the ratio of red to blue beads is now 1 : 3 Jan gains 2 more marbles and the ratio is now 7 : 8 How many red beads were there initially? How many marbles did each own initially? The ratio of men to women at a concert is 5 : 3 The ratio of Ann and Bob s ages are in the ratio 3 : 4 The ratio of women to children at the concert is 7 : 4 In 7 years time the ratio will be 4 : 5. How many people are at the concert? How old are they now?
Mark and correct your work Jan and Kim own numbers of marbles that are the ratio 5 : 6 The ratio of red to blue beads in a bag is 1 : 4 5 red beads are added to the bag so that the ratio of red to blue beads is now 1 : 3 Jan gains 2 more marbles and the ratio is now 7 : 8 How many red beads were there initially? 15 How many marbles did Jan own initially? 40 The ratio of men to women at a concert is 5 : 3 The ratio of Ann and Bob s ages are in the ratio 3 : 4 The ratio of women to children at the concert is 7 : 4 In 7 years time the ratio will be 4 : 5. How many people are at the concert? 68 How old are they now? 28 and 35
