Lesson Menu Five-Minute Check (over Lesson 1–1) Main Idea Example 1:Problem-Solving Skill
Main Idea/Vocabulary I will use the four-step plan to solve problems.
Example 1 Dina’s family went to a zoo. They learned that a roadrunner is 1 foot tall. An African elephant is 12 feet tall. How much taller is an African elephant than a roadrunner?
Example 1 Understand What facts do you know? The roadrunner is 1 foot tall. The African elephant is 12 feet tall. What do you need to find? You need to find how much taller an African elephant is than the roadrunner.
Example 1 Plan To find out how much taller the African elephant is than the roadrunner, subtract.
Example 1 Solve Answer: So, the elephant is 11 feet taller than the roadrunner. 12 1 – 11
Example 1 Check Since addition and subtraction are inverse operations, you can use addition to check subtraction. So, the answer is correct.