CPM Homework Banner

Home > CC2 > Chapter 2 > Lesson 2.3.1 > Problem 2-117


Copy each expression and then simplify it without using a calculator. Be sure to show all steps.  




Compute without a calculator

This sum can be represented with a diagram: Diagram expression with 2 equal sized rectangles: Left Rectangle + Right Rectangle. Left rectangle, 4 rows of 2 columns, with 5 shaded. Right Rectangle, 4 rows of 4 columns, with 9 shaded.

Find a common denominator to add the two fractions. Changes: the columns of the left rectangle are divided in half so that there are now 4 rows of 4 columns, with 10 shaded.

Changes: After right rectangle, an equal sign and the fraction 19 sixteenths.

See part (a) for strategy.

Draw squares on your paper like this: 8 square tiles. 

8 square tiles.

Cross off . What is left?