Mrs. Edwards is
building a dollhouse
for her children. She
needs to buy wood
for the railing on
the balcony.
Dollhouse
4 7 in.
Dollhouse
balcony
- 51 in. →
The wood is available in 12-inch, 14-inch, and 16-inch lengths. She does
not want to waste wood. What length should she buy?
continued on the next page >
Investigation 1 Extending Addition and Subtraction of Fractions