CBSE Class 7 Maths - Integers - NCERT Exercise 1.3 (#cbsenotes)

Integers

EXERCISE 1.3

CBSE Class 7 Maths

Q1: Find each of the following products:
(a) 3 × (–1)
(b) (–1) × 225
(c) (–21) × (–30)
(d) (–316) × (–1)
(e) (–15) × 0 × (–18)
(f) (–12) × (–11) × (10)
(g) 9 × (–3) × (– 6)
(h) (–18) × (–5) × (– 4)
(i) (–1) × (–2) × (–3) × 4
(j) (–3) × (–6) × (–2) × (–1)


Answer:
(a) 3 × (–1) = = –3

(b) (–1) × 225 = -225

(c) (–21) × (–30) = 630

(d) (–316) × (–1) = 316

(e) (–15) × 0 × (–18) = 0

(f) (–12) × (–11) × (10) = 132 × 10 = 1320

(g) 9 × (–3) × (– 6) = 9 × 18 = 162

(h) (–18) × (–5) × (– 4) = 90 × (–4) = –360

(i) (–1) × (–2) × (–3) × 4 = –6 × 4 = -24

(j) (–3) × (–6) × (–2) × (–1) = 18 × 2 = 36

CBSE Class 12 - Biology - Human Reproduction - Important Terms (#cbsenotes)

Human Reproduction

Important Terms

CBSE Class 12 - Biology 

Male Reproductive System
credits: Wikimedia under CC 3.0

Q1: Define Spermatogenesis.

Answer:  It is the process of production of sperms by immature male germ cells that begins at puberty (Production of sperm).

Q2: Define Spermiogenesis

Answer: It is the process of transformation of spermatids into sperm.


Q3: What is spermiation?

Answer: It is the release of sperms from seminiferous tubule.

CBSE Class 9 - Unit Test Paper English Sample Question Paper (2017-18)(#cbsepapers)

CBSE Class 9 - Unit Test Paper English Sample Question Paper (2017-18)

CBSE Class 6 Maths - Playing With Numbers - NCERT Exercise 3.7 (#cbsenotes)

Playing With Numbers

EXERCISE 3.7

CBSE Class 6 Maths

Q1: Renu purchases two bags of fertiliser of weights 75 kg and 69 kg. Find the maximum value of weight which can measure the weight of the fertiliser exact number of times.

Answer: 
 The maximum weight  = HCF of 75 and 69.
 Factors of 75   = 3 ✕ 5 ✕ 5
 Factors of 69   = 3 ✕ 69
    HCF  = 3
 ∴ the required weight is 3 kg.

Q2: Three boys step off together from the same spot. Their steps measure 63 cm, 70 cm and 77 cm respectively. What is the minimum distance each should cover so that all can cover the distance in complete steps?

CBSE Class 7 Maths - Integers - NCERT Exercise 1.2 (#cbsenotes)

Integers

EXERCISE 1.2

CBSE Class 7 Maths

Q1: 1. Write down a pair of integers whose:
(a) sum is –7
(b) difference is –10
(c) sum is 0

Answer:
(a) One such pair whose sum is -7 = -4 + (-3) = -7
(b) One such pair whose difference is -10 = -3 - 7 = 10
(c) One such pair whose sum is 0 = -5 + 5 = 0

CBSE Class 9 - Unit Test Paper Hindi(हिंदी) Sample Question Paper (2017-18) (#cbsepapers)

CBSE Class 9 - Unit Test Paper Hindi (हिंदी) Sample Question Paper (2017-18)

CBSE Class 6 Maths - Playing With Numbers - NCERT Exercise 3.6 (#cbsenotes)

Playing With Numbers

EXERCISE 3.6

CBSE Class 6 Maths

Q1: Find the HCF of the following numbers:
(a) 18, 48
(b) 30, 42
(c) 18, 60
(d) 27, 63
(e) 36, 84
(f) 34, 102
(g) 70, 105, 175
(h) 91, 112, 49
(i) 18, 54, 81
(j) 12, 45, 75

Answer:

(a) Factors of 18 = 2 × 3 × 3
Factors of 48 = 2 × 2 × 2 × 2 × 3
HCF (18, 48) = 2 × 3 = 6

(b) Factors of 30 = 2 × 3 × 5
Factors of 42 = 2 × 3 × 7
HCF (30, 42) = 2 × 3 = 6

(c) Factors of 18 = 2 × 3 × 3
Factors of 60 = 2 × 2 × 3 × 5
HCF (18, 60) = 2 × 3 = 6