standard_description: Solve word problems involving addition and subtraction of fractions referring to the same whole, including cases of unlike denominators, e.g., by using visual fraction models or equations to represent the problem. Use benchmark fractions and number sense of fractions to estimate mentally and assess the reasonableness of answers. For example, recognize an incorrect result 2/5 + 1/2 = 3/7, by observing that 3/7 < 1/2.
problem_activity: Narrative
The purpose of this Choral Count is for students to practice counting on by 5 and to notice patterns in the count. These understandings help students develop fluency and will be helpful later in this lesson and future lessons when students show their thinking when finding total values of sets of coins.
Launch
“Count by 5, starting at 15.”
Record in a single row as students count.
Stop counting and recording at 85.
“Count by 5, starting at 40.”
Record in a single row directly below the first count as students count. Put 40 directly below 20, so that the fives and zeros in the ones place of each number are aligned.
Stop counting and recording at 100.
Activity
“What patterns do you see?”
1
–
2 minutes: quiet think time
Record responses.
Student Response
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Activity Synthesis
“Who can restate the pattern in different words?”
“Does anyone want to add an observation as to why that pattern is happening here?”


aligns: no