Multiples, Factors, Divisors & Primes

Interactive macro-enabled MS-Excel spreadsheet. Contents: Find the first 12 multiples of a number & show them on a № square. Find all the factors of a number & show them on a № square. Find all prime numbers less than 100 or 144 (sieve of Eratosthenes). Find all prime numbers within a given range (a ≤ prime № ≤ b). Know the tests of divisibility for select small numbers (2 ≤ № ≤ 25). Apply tests of divisibility to find which №s are multiples or factors. Find the highest common factor & lowest common multiple (lists). Find the highest common factor & lowest common multiple (ratio). Write a number as the product of its prime factors by PFD (tree). Write a number as the product of its prime factors by PFD (table). Complete a table of ten numbers written as a product of its primes. Find the HCF & LCM of 2 or 3 numbers using PFD & Venn diagrams. Find the first ten twin prime pairs & evaluate each sum & product.