Question

Jake is mapping out important family events. He uses negative numbers to represent time before he was born and positive numbers to represent time after he was born. For example, Jake's mum was born in year −20, and Jake's sister was born in year 5. How old was Jake's mum when his sister was born

Answer 1

Start at -20 and move right to +5

How far have you moved? That's how many years had passed