How can you challenge 5-6 year old on learning number bond to 10?

Marquise has 200 meters of fencing to build a rectangular garden. the garden's area (in square meters) as a function of the garden's width w w (in meters) is modeled by: a ( w ) = − w 2 + 1 0 0 w a(w)=−w 2 +100w what side width will produce the maximum garden area? meters

8litres of paint can cover 129.6 m². how much paint is required to paint an area of 243m²?

A11 gram sample of a substance that’s used to treat thyroid disorders has a k-value of 0.1247