Number Theory

Roman Numerals

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Roman Numerals What are Roman Numerals? Roman Numerals are a number system that originated in the ancient Rome that are written by combinations of letters from Latin alphabet. In this system the number we know today are written with letters. Roman numerals use seven letters: I,V, X, L, C, D and M that represents the number 1, […]

Operations with positive and negative numbers

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Operations with positive and negative numbers What are positive and negative numbers?Positive numbers are numbers that are greater then zero.Negative numbers are numbers that are less then zero. Visualizing positive and negative numbers on a number line Positive numbers are written without a sign or with a “+” in front of them. Meanwhile negative numbers […]

HCF and LCM

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HCF and LCM  How to find HCF and LCM? One method to find both HCF and LCM by using Prime factorization. Finding HCF using prime factorization Step 1: Find the prime factors of each given number. Step 2: Identify all the common prime factors of the given numbers. Step 3: Multiply the common factors.The product of these common […]

Prime and composite numbers

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Prime and Composite numbers Prime numbers are numbers that have exactly two factors: one and the number itself. Composite numbers are numbers that have more than two factors. Finding prime numbers Over 2000 years ago, a Greek mathematician called “Eratosthenes” made a simple tool for sorting out prime numbers. This tool is called the “Sieve of Eratosthenes” […]

Multiples and Factors

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Multiples and Factors Multiples You can think multiples of a number as the” times table” for that number. For example: the multiplies of 3 are:3 × 1 = 3,  3 × 2 = 6,  3 × 3 = 9 and so on. A multiple of a number is found when you multiply that number by a positive integer. The […]

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