REVISION

DATE:20.02.2017

REVISION

COMPAIRING QUANTITIES

1.Tell what is the profit or loss in the following transactions. Also find profit percent or loss percent in each case.

(a) Gardening shears bought for Rs. 250 and sold for Rs. 325.

(b) A refrigerator bought Rs. 12,000 and sold at Rs. 13,500.

(c) A cupboard bought for Rs. 2,500 and sold at Rs. 3,000.

(d) A skirt bought for Rs. 250 and sold at Rs. 150.

2. Convert each part of the ratio to percentage:

(a) 3 : 1  (b) 2 : 3 : 5  (c) 1 : 4  (d) 1 : 2 : 5

3. (i) Chalk contains Calcium, Carbon and Oxygen in the ratio 10 : 3 : 12. Find the percentage of

Carbon in chalk.

(ii) If in a stick of chalk, Carbon is 3 g, what is the weight of the chalk stick?

4. Find the amount to be paid at the end of 3 years in each case:

(a) Principal = Rs. 1,200 at 12% p.a.

(b) Principal = Rs. 7,500 at 5% p.a.

DATE:13.02.2017 REVISION

ALGEBRAIC EXPRESSIONS

1) Identify the terms and factors in the expressions given below:

(a) –4x+5  (b) –4x+5y  (c) 5y+3y²  (d) xy+2x²y²  (e) pq+q

2.If m=2, find the value of:

(i) m–2   (ii) 3m–5  (iii) 9–5m  (iv) 3m²–2m–7  (v) 5m²–4

3.Find the value of the following expressions, when :x=–1

(i) 2x–7 (ii) –x+2 (iii) x²+2x+1 (iv) 2x²–x–2

4.Simplify combining like terms:

1.    21b–32+7b–20b

2.    –z²+13z²–5x+7z³–15z

3.    p–(p–q)–q–(q–p)

4.    3a–2b–ab–(a–b+ab)+3ab+b–a

5.    5x²y–5x²+3yx²–3y²+x²–y²+8xy²–3y²

6.    (3y²+5y–4)–(8y–y²–4)

DATE:07.02.2017

CHAPTER:VISUALISING SOLID SHAPES

1. Identify the nets which can be used to make cubes (cut out copies of the nets and try it): 

HOME WORK CLASS 7

MONTH:FEBRUARY

DATE:01.02.2017

1.The length and breadth of a rectangular piece of land are 500 m and 300 m respectively. Find:

(i) Its area.(ii) The cost of the land, if 1 m2m2of the land costs Rs. 10,000.

2.Find the breadth of a rectangular plot of land, if its area is 440 m2m2and the length is 22 m. Also find its perimeter.

 3.The perimeter of a rectangular sheet is 100 cm. If the length is 35 cm, find its breadth. Also find the area.

4.The area of a square park is the same as of a rectangular park. If the side of the square park is 60 m and the length of the rectangular park is 90 cm, find the breadth of the rectangular park.

5. The perimeter of a rectangle is 130 cm. If the breadth of the rectangle is 30 cm, find its length. Also, find the area of the rectangle.

DATE:04.02.2017

1.A garden is 90 m long and 75 m broad. A path 5 m wide is to be built outside and around it. Find the area of the path. Also find the area of the garden in hectares.

2.A 3 m wide path runs outside and around a rectangular park of length 125 m and breadth 65 m. Find the area of the path.

3.Through a rectangular field of length 90 m and breadth 60 m, two roads are constructed which are parallel to the sides and cut each other at right angles through the centre of the fields. If the width of each road is 3 m, find:(i) the area covered by the roads.

(ii) the cost of constructing the roads at the rate of Rs. 110 perm2m2.

4.Pragya wrapped a cord around a circular pipe of radius 4 cm (adjoining figure) and cut off the length required of the cord. Then she wrapped it around a square box of side 4 cm (also shown). Did she have any cord left? (Take π = 3.14)