Students will be able to solve word problems involving three-digit subtraction.
- Begin by telling students you are going to share a subtraction story.
- Ask students what they think a “subtraction story” might be. Take a few answers.
- Explain that a subtraction story is a real-world situation where subtraction is used to solve a problem or come up with a solution.
Explicit Instruction/Teacher modeling(10 minutes)
- Tell students the following subtraction story: Mario had 384 leaves in his backyard. He raked 142 leaves. How many leaves were left in the backyard?
- Write on the board 384 - 142 = ___. Explain that you’ll need to figure out how many leaves were left when 142 was subtracted from 384.
- Solve the problem, explaining the steps you took aloud.
Guided practise(10 minutes)
- Now tell students it’s their turn to solve a subtraction story.
- Tell students the following story:
- Kelly had 673 beads in her bead collection. She made jewelry for her family using 371 beads. How many beads did Kelly have left?
- Have students turn to a partner and work together to solve the problem.
- Take a few answers from the class.
Independent working time(20 minutes)
- Hand out paper to each student. Tell them to write three subtraction stories for a partner to solve. The subtraction stories should involve three-digit numbers.
- After students are done writing the stories, they should switch papers with a partner.
- Have students solve each other’s subtraction stories.
Enrichment:Have students create and solve subtraction stories that involve regrouping.
Support:Have students create and solve subtraction stories that do not involve regrouping.
- Assess students’ understanding by observing both how they write and how they solve subtraction stories.
Review and closing(5 minutes)
- Call on a few pairs of students share their stories and answers with the class.