1) Appoint someone (the Defender) in your group to stand by your group work. 2) The rest of members will walk (in clockwise direction to the nearest group) and ask questions. The Defender will ‘defend’ the groups’ choice of diagram. 3) Wait for MrDanny to give signal to move on. 1-2 min per group.
S31. At present, Ronald is 3 times as old as his sister. In 22 years' time, Ronald's age will be 19 years less than twice his sister's age. How old is Ronald now? [HenryPark]
S32. Irene had a total of 1686 red, blue and green balloons for sale. The ratio of the number of red balloons to the number of blue balloons was 2 : 3. After Irene sold 3/4 of the blue balloons, 1/2 of the green balloons and none of the red balloons, she had 922 balloons left. How many blue balloons did Irene have at first? [Raffles]
S33. In a cinema, the ratio of the number of girls to the number of boys was 3:2. The ratio of the number of women to the number of boys was 5:4. The ratio of the number of girls to the number of men was 2:5. During the movie, 6 women and 27 men left the cinema. The ratio of the number of women to the number of men then became 1:2.
a) Express the number of women as a fraction of the number of men at first. Leave your answer in its simplest form. b) How many children were there in the cinema? [Nanyang]
S34. Marina has 200 more books then Ethel. Marina gives 60% of his books to Ethel. Ethel then gives 25% of her books back to Marina. In the end, Ethel has 200 more books than Marina. How many books does Marina have at first? [SCGS]
Gallery Walk Rules
ReplyDelete1) Appoint someone (the Defender) in your group to stand by your group work.
2) The rest of members will walk (in clockwise direction to the nearest group) and ask questions. The Defender will ‘defend’ the groups’ choice of diagram.
3) Wait for MrDanny to give signal to move on. 1-2 min per group.
S31. At present, Ronald is 3 times as old as his sister. In 22 years' time, Ronald's age will be 19 years less than twice his sister's age. How old is Ronald now? [HenryPark]
ReplyDeleteS32. Irene had a total of 1686 red, blue and green balloons for sale.
The ratio of the number of red balloons to the number of blue balloons was
2 : 3.
After Irene sold 3/4 of the blue balloons, 1/2 of the green balloons and none of the red balloons, she had 922 balloons left.
How many blue balloons did Irene have at first? [Raffles]
S33. In a cinema, the ratio of the number of girls to the number of boys was 3:2.
The ratio of the number of women to the number of boys was 5:4.
The ratio of the number of girls to the number of men was 2:5.
During the movie, 6 women and 27 men left the cinema.
The ratio of the number of women to the number of men then became 1:2.
a) Express the number of women as a fraction of the number of men at first. Leave your answer in its simplest form.
b) How many children were there in the cinema? [Nanyang]
S34. Marina has 200 more books then Ethel. Marina gives 60% of his books to Ethel. Ethel then gives 25% of her books back to Marina. In the end, Ethel has 200 more books than Marina. How many books does Marina have at first? [SCGS]