Question

In the last three weeks a recycling center collected 67 lb, 42 lb and 74 lb of aluminum cans. How many pounds of aluminum were collected during this three-week period?

Answer 1

183

Explanation:

We can add the amounts from each week:

`color(white)(00)6^(1)7`
`color(white)(000)42`
`ul(+color(white)(0)74)`
`color(white)(00)183`

See that we added `7+2+4=13` and so we write down the 3 and carry the 1 to the tens position, giving `1+6+4+7=18`