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Ex 3.1, 3 - Chapter 3 Class 6 Playing with Numbers
Last updated at April 16, 2024 by Teachoo
Chapter 3 Class 6 Playing with Numbers
Concept wise
-
Factors and Multiples
- Perfect number
- Prime and Composite Numbers
- Sum of prime numbers
- Prime numbers from 1 to 100
- Divisibility Tests - Divisibility by 5, 10, 2
- Divisibility Tests - Divisibility by 4, 8
- Divisibility Tests - Divisibility by 3, 6, 9
- Divisibility Tests - Divisibility by 11
- Divisibility Tests - All
- Common Multiples
- Common Factors
- More Divisibility Rules
- Factor Tree
- Prime Factorisation
- Highest Common Factor
- Lowest Common Multiple
- Statement questions on LCM
- Statement questions on HCF
Transcript
Ex 3.1, 3 Match the items in column 1 with the items in column 2. Multiples of 8 are 8, 16, 24, 32, 40, 48…. Multiples of 7 are 7, 14, 21, 28, 35, 42…. Multiples of 70 are 70, 140, 210, 280, 350, 420…. Factors of 30 are 1 × 30 = 30 2 × 15 = 30 3 × 10 = 30 4 × 5 × 6 = 30 6 × 5 = 30 We stop here as 5 & 6 have occurred earlier. ∴ Factors of 30 are 1, 2, 3, 5, 6, 10, 15, 30 Factors of 50 are 1 × 50 = 50 2 × 25 = 50 3 × 4 × 5 × 10 = 50 … 10 × 5 = 50 We stop here as 10 & 5 have occurred earlier. ∴ Factors of 50 are 1, 2, 5, 10, 25, 50 Factors of 20 are 1 × 20 = 20 2 × 10 = 20 3 × 4 × 5 = 20 5 × 4 = 20 We stop here as 5 & 4 have occurred earlier. ∴ Factors of 20 are 1, 2, 4, 5, 10, 20 Multiples of 8 are 8, 16, 24, 32, 40, 48…. Multiples of 7 are 7, 14, 21, 28, 35, 42…. Multiples of 70 are 70, 140, 210, 280, 350, 420…. Factors of 30 are 1, 2, 3, 5, 6, 10, 15, 30 Factors of 50 are 1, 2, 5, 10, 25, 50 Factors of 20 are 1, 2, 4, 5, 10, 20
