Page 360 - Start Up Mathematics_8 (Non CCE)

Section C

3. Fill in the blanks: 1 M × 5 = 5 M
(a) The rational number equal to its reciprocal is __________.
(b) The standard form of 34.95 × 10 = __________.
–4
(c) On dividing a perfect square by 4, the remainder is ____________ or ____________.
(d) The units digit of the cube of 488 is ____________.
(e) In algebraic expressions, the elements separated by ‘+’ or ‘–’ sign are called ____________.

Section D

4. Give one word or sentence for the following: 1 M × 5 = 5 M
(a) What do you understand by absolute value of a rational number?
(b) If x × x = x , what is the value of m?
5
–3
m
(c) Define perfect squares.
(d) What will be the last digit of the cube of a number ending with 8?
(e) What is an algebraic expression?

Section E

5. Find the square root of 0.032041. 2 M

6. If x 2 + 1 = 23, find the value of +x 1 . 3 M
x 2 x

Project Work

Algebraic Expressions

Verify the identity (a – b) = a – 2ab + b for a = 12 cm and b = 5 cm by cutting and pasting.
2
2
2

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