Activity
National Council of Teachers of Mathematics

The Math Forum: Basic Divisibility Rules

For Students 9th - 10th
This site offers a short quick reference list of divisibility rules with links to the explanations
Interactive
Calculator Soup

Calculator Soup: Lcm Calculator Least Common Multiple

For Students 9th - 10th
The Least Common Multiple (LCM) is also referred to as the Lowest Common Multiple (LCM) and Least Common Divisor (LCD). For two integers a and b, denoted LCM(a,b), the LCM is the smallest positive integer that is evenly divisible by both...
Activity
National Institute of Educational Technologies and Teacher Training (Spain)

Ministerio De Educacion: Divisores Y Primos

For Students 3rd - 8th Standards
Reinforce your knowledge on prime numbers and their divisors.

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