Page 130 - Maths Skills - 7

128 Maths

Q. 2. Assertion (A): xy + 7 is a binomial. to represent the situation with ‘n’ as number
Reason (R): An algebraic expression with two of hours.
terms is called binomial. 2. A pizza delivery person earns ` 30 per hour plus
Q. 3. Assertion (A): Polynomial 9x + 7 is a quadratic ` 10.50 for each delivery mode. The expression
2
polynomial. 30 h + 10.5 d can be used to find the earning
Reason (R): The degree of above polynomial for him. How much money will he earn after
is 2. working for 15 hours and making 8 deliveries?
3. If 2a – 2 = 4 and 0.05b = 0.25
SUBJECTIVE TYPE QUESTIONS
Find the value of a – b .
2
3
F. Solve the following word problems
1. The cost of renting a bicycle for ride is ` 20 plus
` 10 for each hour. Write an algebraic expression

HOTS

1. Write the sentence as an algebraic expression “Sum of five times w and three times x, minus the quotient
of y and twice z”.
4 − 2
x y
2. Evaluate the value of
y + x
x z
3. Simplify the expression: 3x – 2{3(2x – y) – 1} – 5{y – (4y + z)} when x = 3, y = –1 and z = 2.

Word Stock
Factor Variable Constant Coefficient Row Column Value
Segment Pattern Expression Method Quantity Multiple

Activity

Objective: To understand algebraic expressions with the help of tiles.

Pre-Requisite Knowledge: Concept of algebraic expression x 1 1 1

Materials Required: Algebraic tiles and one bowl x x 2 x 1

Procedure: 1. Distribute a bowl full with algebraic tiles among
each student.

2. Tell the students that the x tile is x units long and x x
2
units wide. The x tile is 1 unit wide and x units long. The 1 tile is 1 unit long and 1 unit wide.
3. Now arrange the tiles in different ways and ask the students to give the general expression for
that arrangement. x

Conclusion: The algebraic expression is x + 3x + 2. x 2 x 1 1
2

x