ICSE Class 5 Maths, Unit 4: Playing with Numbers (Factors and Multiples)
From the CISCE curriculum. 8 key concepts, about 4 days of study at 20 to 30 minutes a day.
What this unit aims at
There are many relationships in the Numbers system which include even and odd numbers, prime and composite numbers. The classification of numbers into two groups is made on the basis of some properties of the numbers. Factors are one of such properties. Work with prime and composite numbers extends understanding of factors, divisors and multiples encountered in the study of multiplication and division. Children should learn that factors and division mean the same thing and that they can be used interchangeably. When two whole numbers are multiplied they should yield a product and can be called either factors or divisors of their product (exceptionally zero can be a factor but not a divisor). The product of two numbers also called multiple of the two numbers is another concept that is directly related with multiplication of numbers. The children then can adopt any of the two ways of findi
Your child should be able to
- write multiples of numbers
- find factors of numbers
- identify prime and composite numbers, twin primes and co-prime numbers
- test divisibility of numbers by 2, 3, 4 and 5
- find prime factors- by Factor Tree
- find the Highest Common Factor (HCF)- Listing Method and Common Division
- find the Lowest Common Multiples (LCM)- Listing Method and Common division
- relate HCF and LCM and uses to find one when other is given
Key concepts in this unit
- Factors, common factors and Highest common factors of two numbers.
- Multiples, common multiples and Lowest Common multiples of two numbers.
- Prime and composite numbers, Twin primes and co-prime.
- Prime factors- Factor Tree Method.
- Highest Common Factor(HCF)- Listing Method
- and Common Division.: Lowest Common Multiples(LCM)- Listing Method and Common Division.
- and Common Division.: Relationship between HCF and LCM.
- and Common Division.: Test for divisibility by 2, 3, 4, 5, 9 10, 11 (forming rules by observation).
Teach this unit at home
- A day-by-day plan from the CISCE concepts, so you know what to cover each day.
- A step-by-step script for each day, so you know what to say and ask (AI-written from the CISCE curriculum, so check it against your child's school book).
- A quiz at the end.
From the CISCE Curriculum for Classes I to VIII (2016). CISCE sets what is taught, not the textbooks, so schools use different books and there are no page numbers here. Adhian Gurus is not affiliated with CISCE.