Question 2 In which of the following expressions only numbers are used-a y-3b 7 - 20-8 zc 521-7-7 - 2d 5e 3 xf 5-5 ng 7 - 20-5 - 10-45- p

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Standard VII

Mathematics

Variable

Question 2 In...

Question

Question 2

In which of the following expressions only numbers are used:

(a) y + 3

(b) $(7 \times 20) - 8 z$

(c) $5 (21 - 7) + 7 \times 2$

(d) 5

(e) 3x

(f) 5-5n

(g) $(7 \times 20) - (5 \times 10) - 45 + p$

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Solution

(c) and (d) are the expressions with only numbers. All the other expressions have variables. A variable is a letter that represents an unknown number which can take any value.

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Similar questions

Which out of the following are expressions with numbers only?

(a) y + 3 (b) (7 × 20) − 8z

(e) 3x (f) 5 − 5n

(g) (7 × 20) − (5 × 10) − 45 + p

Q. Which out of the following are expression with numbers only?
(a)

y + 3

(b)

(7 \times 20) - 8 z

(c)

5 (21 - 7) + 7 \times 2

(d)

5

(e)

3 x

(f)

5 - 5 n

(g)

(7 \times 20) - (5 \times 10) - 45 + p

Q. Which of the following are expression with number only?

(7 \times 20) - (5 \times 10) - 45 + p

Q. Which of the following statements are true:

(i) 10

\div

(5 × 2) = (10

\div

5) × (10

\div

2)
(ii) (35 − 14)

\div

7 = 35

\div

7 − 14

\div

7
(iii) 35 − 14

\div

7 = 35

\div

7 − 14

\div

7
(iv) (20 − 5)

\div

5 = 20

\div

5 − 5
(v) 12 × (14

\div

7) = (12 × 14)

\div

(12 × 7)
(vi) (20

\div

\div

2 = (20

\div

\div

Question 6

Which of the following expressions show that rational numbers are associative under multiplication.
(a) $\frac{2}{3} \times (\frac{- 6}{7} \times \frac{3}{5}) = (\frac{2}{3} \times \frac{- 6}{7}) \times \frac{3}{5}$
(b) $\frac{2}{3} \times (\frac{- 6}{7} \times \frac{3}{5}) = \frac{2}{3} \times (\frac{3}{5} \times \frac{- 6}{7})$
(c) $\frac{2}{3} \times (\frac{- 6}{7} \times \frac{3}{5}) = (\frac{3}{5} \times \frac{2}{3}) \times \frac{- 6}{7}$
(d) $(\frac{2}{3} \times \frac{- 6}{7}) \times \frac{3}{5} = (\frac{- 6}{7} \times \frac{2}{3}) \times \frac{3}{5}$

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Variable

Standard VII Mathematics

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Question 2 In which of the following expressions only numbers are used: (a) y + 3 (b) (7×20)−8z (c) 5(21−7)+7×2 (d) 5 (e) 3x (f) 5-5n (g) (7×20)−(5×10)−45+p

(c) and (d) are the expressions with only numbers. All the other expressions have variables. A variable is a letter that represents an unknown number which can take any value.

Question 2

In which of the following expressions only numbers are used:

(a) y + 3

(b) $(7 \times 20) - 8 z$

(c) $5 (21 - 7) + 7 \times 2$

(d) 5

(e) 3x

(f) 5-5n

(g) $(7 \times 20) - (5 \times 10) - 45 + p$