Have you ever wondered how many zeros there are in a trillion or a vigintillion? It helps to think in terms of groups of three zeros.
What is the biggest number in the Universe? - BBC Science Focus
Millions, Billions and Other Large Numbers
Brains are bad at big numbers, making it impossible to grasp what
Amazing Tricks To Help You Understand Very Large Numbers
What are some interesting and really large numbers (as in, really
Mix it up with Math! Large numbers and place value
Why is Number Sense So Important? - The Write Stuff Teaching
Understanding Very Large Numbers
How Many Zeros Are in a Million, Billion, and Trillion?
Everyday maths 1 (Wales): Session 1: 1.3