The fuel tank in Jack's car holds 52 litres of petrol, to the nearest litre. What is the least amount of fuel the tank could hold? Josie is 130 cm tall to the nearest 10 cm. What is the shortest Josie could be? Amy scores 9960 points on a new game, to the nearest 10. Bill scores 9900 points to the nearest 100. Who did better? Amy, Bill, Can't tell

Jack's fuel tank, measured to the nearest litre, could actually hold as little as 51 litres. This is because if it were any less than 51.5 litres, rounding would bring it down to 51 litres. It could also hold as much as 52.5 litres, but when rounded, it still appears as 52 litres.

As for Josie, measured to the nearest 10 cm, she could be as short as 125 cm. Just like with the litres, if she were 124.5 cm or lower, it would round down to 120 cm when rounding to the nearest 10 cm. She's likely very sprightly at her height!