Grades 3-5 Math Problem Solving in Action_ Getting Students to Love Word Problems

Modeling Thinking ◆ 117

Problem B: Sue has 10 marbles. She has 2 times as many as her sister. How
many does her sister have? How many do they have altogether?

Figure 7.13

http://www.mathlearningcenter.org/web-apps/number-rack/

Figure 7.14

http://www.mathlearningcenter.org/web-apps/number-rack/

Problem C: Sue has 9 marbles. Her sister has 3 marbles. How many times
as many marbles does Sue have as her sister? How many do they have
altogether?

Figure 7.15

http://www.mathlearningcenter.org/web-apps/number-rack/

Problem D: Expert Extension to above problem: If her sister got some
more marbles and now she has 2 times as many marbles as Sue, how many did
she get?