Source 4

1. If Lonnie Johnson was born in 1949, how old would he be now?  How much older than you is he? 

How long did it take him to develop the Super Soaker? 

Write out $200 million and $73 million in numbers. 

Can you round $73 million to the nearest 10 million?

How much bigger is $200 million than $73 million?

The factory told him that it would cost $200,000 to get the first 1,000 guns, how much does that mean each gun costs to make?

When Lonnie was 13 he made a go-kart, if he was born in 1949 what year did he build the go-kart?

One of the SuperSoaker models Lonnie made was 628mm long and the diameter of the water stream was 2.4mm and could reach more than 12 meters. 

a.) What is 628mm in cm?
b.) What is 2.4mm in cm?
c.) What is 12metres in cm and mm?

If Lonnie came up with the idea for the Super Soaker in 1982 and it came into shops in 1990, use column subtraction to find out how long did it took him to finalise it?