Secondary School (English Medium) (5 to 8) कक्षा ५ - CBSE Question Bank Solutions for Mathematics

There are two beautiful lakes near a village. People come for boating and picnics in both the lakes. The village Panchayat is worried that with the noise of the boats the birds will stop coming. The Panchayat wants motorboats in only one lake. The other lake will be saved for the birds to make their nests.

• A longer boundary around the lake will help more birds to lay their eggs. So which lake should be kept for birds? Which lake should be used for boats?

There are two beautiful lakes near a village. People come for boating and picnics in both the lakes. The village Panchayat is worried that with the noise of the boats the birds will stop coming. The Panchayat wants motorboats in only one lake. The other lake will be saved for the birds to make their nests.

• Find the area of lake B on the drawing in square cm. What is its actual area in square km?

There are two beautiful lakes near a village. People come for boating and picnics in both the lakes. The village Panchayat is worried that with the noise of the boats the birds will stop coming. The Panchayat wants motorboats in only one lake. The other lake will be saved for the birds to make their nests.

• A longer boundary around the lake will help more birds to lay their eggs. So which lake should be kept for birds? Which lake should be used for boats?

Whose footprint is larger - yours or your friend’s?

How will you decide? Discuss.

Is the area of both your footprints the same?

Each rectangle is made out of 12 equal squares, so all have the same area, but the length of the boundary will be different.

Which of these rectangles has the longest perimeter?

Each rectangle is made out of 12 equal squares, so all have the same area, but the length of the boundary will be different.

Which of these rectangles has the smallest perimeter?

Which has the bigger area - one of your footprints or the page of this book?

Which has the smaller area - two five-rupee notes together or a hundred rupee notes?

Look at a 10 rupee note. Is its area more than hundred square cm?

Is the area of the blue shape more than the area of the yellow shape? Why?

Look at the figure in the white box. On which of the dotted lines will you keep the mirror so that you get shape (b)? Also, tell which part of the picture will be hidden when we keep the mirror on the dotted line.

Now make a line on the white box to show where you will keep the Mirror Games mirror to get the picture next to it.

Have you ever seen a windmill? What is it used for?

Does your windmill look the same on `1/4` of the turn?

Does it look the same on half a turn? Discuss.

Does the fan look the same on the `1/4` turn?

Will this fan also look the same after the `1/4` turn? Draw in the yellow box

Which fan will look the same on a `1/3` turn?