Download Math CLASS-VIII - JNV South Sikkim

Math’s assignMent for suMMer vacation. Class-8th
Chapter 1 Rational numbers
Q.1 Is zero a rational number? If yes, give two examples.
Q.2 What are the identity elements for the addition and multiplication of rational numbers?
Q.3 Write four rational numbers which are greater than - 31 and less than 4.
Q.4 Find ten rational numbers between 2 and 3. Q.5 Represent ½,4/5,6/10 on number line.
Q.6 find 3 rational number between ¼ and ½ . Q.7Write five rational number between -2/3
and 5/4.
Q.8 Write the additive inverse of -7/9 and 5/8. Q.9 Write the multiplicative inverse of -15,
12/25 ,-1.
Q.10 Multiply 6/11 by the reciprocal of -7/3.
CHAPTER – 3 UNDERSTANDING QUADRILATERALS
Q.1 What is the sum of the measures of the four angles of a quadrilateral?
Q.2 If the diagonals of a quadrilateral bisect each other at right angle, the
quadrilateral is called .............. Q.3 The adjacent angles in a parallelogram are.............
Q.4 State true or false :A pentagon is a concave polygon. Q.5 A regular polygon is both
equiangular and..........
Q.6 The adjacent sides of a parallelogram are in the ratio 3:7 and its perimeter is
100 cm. Find the sides of the parallelogram.
Q.7 The angles of a quadrilateral are in the ratio 2:3:4:6. Find the measure of the angles.
Q.8 Find the number of sides of a regular polygon whose each exterior angle has a measure of
36°.
Q.9 DiagonalsAC and BD of a rectangleABCD intersect each other at point O. If OA=3cm, Find
AC and BD.
Q.10 Lengths of the diagonals AC and BD of a rhombus are 6cm and 8 cm res. Find the side of
the rhombus.
ASSIGNMENT WORK FOR 1ST Formative assessment 2016-17
Objective : Write the properties of different kinds of quadrilaterals ,
along with figures giving examples from daily life in a tabular form .
Explain about all the six types of quadrilaterals in details and its uses in
different fields like architecture, engineering, music, science and
INFORMATION TECHNOLOGY.
Project work
Topic: To verify that sum of the angles of a triangle is 180°.
Representation:
 Draw at least 3 different types of triangles and measure their angles .find
the sum of the angles of the triangles.
 Is there any other method of proving the angle sum property of a
triangle?
 Write at least three application of the angle sum property of a triangle .
Suggested web site
http://www.mathwarehouse.com/geometry.
http://users.mct.open.ac.uk.
Practice paper for first formative assessment class 8th
1.
2.
3.
4.
5.
6.
The rational number that does not have a reciprocal (a) 1 (b) 0 (c) 2 (d) -1
What is the multiplicative identity for rational number(a) 2 (b) 0 (c) 1
(d)½
𝑎
−𝑎
𝑎
𝑏
Additive inverse of rational number 𝑏 is (a) 𝑏 (b) 𝑏 (c) 𝑎 (d) a
How many diagonals does a regular hexagon have? (a) 2 (b) 9 (c) 7 (d)3
Sum of measure of exterior angles of any polygon is (a) 180° (b) 90° (c) 360° (d) 270°
−7
5
Write the additive inverse of (a) 9 (b) 7 .
−2
7. Write the multiplicative inverse of (a) -13
(b) -1 x 5 .
8. (a)Express 49 as the sum of 7 odd numbers
(b)How many numbers lies between square of 12 and 13.
9. Find the square of 42 by applying (a+b) ² not by multiplication.
10. Find the square root of 9604 by prime factorization method.
11. In a parallogram RING. If measure of angle R is 70º, find all the others.
12. (a)With out adding find the sum of 1+3+5+7+9+11+13+15+17+19+21+23.
(b) Name the property under multiplication used a x b= b x a .
13. Find the number of sides of a regular polygon who’s each exterior angle has a measure
of 45º.
14. Find the measure of each exterior angle of regular polygon of 9 sides.
15. Measure of two adjacent angles of a parallelogram is in the ratio 3:2. Find the measure
of each of the angles of a parallogram.
−2 −5 −9
16. (a)Represent 11 , 11 , 11 on number line. (b) In ABC, < 𝐵 =90° ,if AB=6cm, BC=8cm,
Find AC,
17. Find Pythagoreans triplets in which one member is 12.
18. Find the smallest number by which 9408 must be divided so that the quotient is a
perfect square. Find the square root of the quotient.
2
4
19. (a) Find 5 rational number between 3 and5. (b) find the square root of 12.25
20. Find the length of the side of a square whose area is 441 m2.
21. Find the smallest square number that is divisible by each of the numbers 4, 9, 10.
22. The greatest negative integer is ------------------------------.
23. Zero is greater than every ----------------------------------- integer.
24. If a integer is greater than 1,It’s reciprocal is------------------1.
25. How many fourths are there in 3.
26. How much is 3/8 of a day?
27. what fraction is 25 years of a century.
28. Multiply the following decimal numbers:a) 2.3x10 b)211.04x4 c)2.5x0.5
29. Find the area of rectangle whose length is 5.7cm and breadth is 3cm?
30. Express as rupees using decimal:a) 5paise b)25rupees 5paise c)250paise d)70paise
31. convert:a) 8km to m b) 12.5cm to dam c)750m to km d) 8.75kg to gram
32. Express in kg:a) 2000gram b) 4580gram