CHAPTER-1(NUMBER SYSTEM)-CLASS 7

CLASS –VII

CHAPTER-1(NUMBER SYSTEM)

Formative Assessment

A.     Fill in the blanks:

1.      2

2.      Decimal Number

3.      8

4.      10

5.      Binary

6.      Hexadecimal

7.      0

B.      State True or False:

1.      T

2.      F

3.      F

4.      F

5.      F

C.      Application based Questions:

                                            i.            Multiply each octal number with 8 having the power 0 for unitary position,starting from the extreme right digit.

                                          ii.            Increase the power one by one ,keeping the base fix. Sum up all products to get decimal number.

2. He can solve this by borrow method as (10-1=1)

Summative Assessment

A.     Multiple choice questions:

1.      Aryabhat

2.      Digital Computer

3.      Binary

4.      1

5.      2

B.       Answer the following questions:

1.      A system for representing (that is expressing or writing) numbers of a certain type is called number system.The types are:

                                            i.            Decimal number system

                                          ii.            Binary number system

                                        iii.            Octal number system

                                         iv.            Hexadecimal number system

2.     The rules are:

                                i.            Divide the given decimal number with the base 2.

                              ii.            Write down the remainder and divide the quotient again by 2.

                            iii.            Repaet the step 2 till the quotient is zero.

3.  The rules for multiplication of two numbers a and b is:

A	B	A*B=C
0	0	0*0=0
0	1	0*1=0
1	0	1*0=0
1	1	1*1=1

4.               The octal number system consists of 8 digits i.e 0 to 7 with base 8. in Octal, a binary number is divided up into groups of only 3 bits, with each group or set of bits having a distinct value of between 000 (0) and 111 ( 4+2+1 = 7 ).

Representation of an Octal Number

MSB	Octal Number							LSB
88	87	86	85	84	83	82	81	80
16M	2M	262k	32k	4k	512	64	8	1