/ Directions: Record 4 equations that solve both of the unknown addends in these word problems.
1. Solving word problems in which both addends are unknown.
Model how to use objects to solve the following story problem: There are 9 dogs. Some dogs are inside. Some dogs are outside. How many dogs could be inside? How many dogs could be outside?
Explain that 9 is the only number given so start with 9 objects.
Emphasize that different equations, can be made using the nine objects.
Model how to imagine 3 dogs go inside and move 3 objects away.
Emphasize that if 3 dogs are inside, then 6 dogs remain outside.
Record the equation 9 = 3 + 6.
Put the 9 objects together again and repeat the same structure to model and record the following equations: 9=4+5
9=1+8
9=7+2
2. Solving word problems in which both addends are unknown.
Model how to use objects to solve the following story problem: There are 12 stickers. Some are heart stickers. Some are truck stickers. How many could be heart stickers? How many could be truck stickers?
Explain that 12 is the only number given so start with 12 objects.
Emphasize that different equations, can be made using the 12 objects.
Model how to imagine 4 heart stickers and move 4 objects away.
Emphasize that if 4 stickers are hearts, then 8 stickers are trucks.
Record the equation 12 = 4 + 8.
Put the 12 objects together again and repeat the same structure to model and record the following equations: 12 = 8 + 4
/ Directions: Record 4 equations that solve both of the unknown addends in these word problems.
1. There are 14 kids at recess. Some are playing tag and some are playing handball. How many kids could be playing tag? How many kids could be playing handball?
Restate the objective.
Direct students to record 4 equations that could solve the following word problem.
Directions: Record 4 equations that solve both of the unknown addends.
1. There are 10 treats on the table. Some are cookies and some are crackers. How many could be cookies? How many could be crackers?
_______ = ______ + _______ _______ = ______ + _______ _______ = ______ + _______ _______ = ______ + _______ 2. There are 13 toys. Some are dolls and some are trains. How many could be dolls? How many could be trains?
Recap today’s lesson with one or more of the following MP questions: MP1: How did objects help you in today’s lesson? MP2: What steps helped you solve the problems? MP5: What strategies were used to solve the problem?