Page 317 - Start Up Mathematics_7

Section C

3. Fill in the blanks: 1 M × 5 = 5 M
(a) In 2 , the base is __________ and the exponent is __________.
5
(b) If scientific form of a number is k × 10 , then k is always less than ________.
n
(c) The sum of algebraic expressions x – y + 1 and y – x – 1 is __________.
3
3
3
3
(d) The value x = –1 is the ____________________ of the equation 2x + 7 = 5.
(e) The decimal 0.72 converted to percentage is __________.
Section D

4. Give one word or sentence for the following: 1 M × 5 = 5 M
(a) How do we compare two numbers in standard form?

(b) Evaluate value of the expression (x + y) (2x + y + 3x) (x + y – 1) at x = 1, y = –1.
2
2
2
(c) When Shefali subtracts thrice the number of marbles she has from 50, she finds the result to be 8.
Find the number of marbles she has.
(d) A number when added to its one-third equals 52. Find the number.
(e) Ashwin buys a book for ` 275 and sells it at a loss of 15%. How much does he sell it for?

Section E

5. Find the solution of the equation 4(x + 6) = 3(2x – 8) mentioning the steps involved. Also verify the
answer obtained. 2 M
6. A person donates 20% of his savings to a charitable trust. He distributes the rest among his two sons
in the ratio 1 : 2. If the total savings of the person is ` 5,26,500, find the amount received by the two
sons. 3 M

Project Work

Visual Reasoning

1. In each of the following figures a figure marked P is followed by four options (i), (ii), (iii) and (iv). Choose
the correct option showing possible reflection of P in base line.

(a)

P (i) (ii) (iii) (iv)

(b)

P (i) (ii) (iii) (iv)
2. The following consists of four figures marked 1, 2, 3 and 4. If the pattern is continued then mark the
next figure from options (a), (b), (c) and (d).

1 2 3 4 a b c d

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