Remember, a prime numbers can only be divided by itself and 1. You can use your knowledge of multiples (times tables) to eliminate numbers. Start with the smallest numbers and work your way up.

BOY 1: Uno más uno es igual a dos. BOY 2: Cinco menos uno es igual a cuatro. BOY 3: Diez dividido por dos es igual a cinco. Tip: This video can be used as an interactive introduction to this ...

"If you build it, they will come” isn’t just a version of a famous film line. For Top 400 firms navigating markets bogged down by supply shortages and delays, it’s strategy. Whether “they ...