Practice Subtraction Strategies
Est. Class Sessions: 1–2
Students build a Subtraction Strategies Menu and discuss which strategies seem to be better suited for different subtraction facts. Students then self-assess their confidence with counting and reasoning strategies for subtraction to choose appropriate practice for developing fluency with these subtraction strategies.
Content in this Lesson
- Solving word problems involving two whole numbers whose sum is between 10 and 20 [E3].
- Representing reasoning of addition and subtraction problems [MPE5].
- Using reasoning strategies to solve subtraction problems [E5].
- Finding the unknown whole number in an addition or subtraction equation relating three whole numbers [E7].
- Choosing appropriate and efficient strategies to solve subtraction facts [MPE2].
- Using strategies that apply the properties of addition to solve subtraction problems [E6].
Materials for Students
| Daily Practice and Problems | Lesson | Homework | Assessment | ||
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Student Books |
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| Student Activity Book |
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Teacher Resources |
Teacher Guide - digital |
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Supplies for Students
20 connecting cubes
desk number line (0–40)
Materials for the Teacher
Display of Subtraction Strategies Menu (Student Activity Book) Page 419
Prepared set of the Subtraction Cards from Small Numbers 1–6 Masters (Teacher Guide) optional
2–5 prepared sets and a display set of the 0–10 Small Ten Frame Cards Masters (Teacher Guide). See Materials Preparation.
2–5 prepared sets and a display set of the 11–20 Ten Frame Flash Cards Masters (Teacher Guide). See Materials Preparation.
Unit 12 Assessment Record
Unit 12 Individual Assessement Record
class number line (0–130)
tape
chart paper
Materials Preparation
Prepare Three Charts. Display and write one of the following titles on each sheet of chart paper: "Counting Up," "Counting Back," and "Reasoning."
Prepare Show Your Strategy Cards. Make 15 copies of the Show Your Strategy Cards Master and cut them apart so you have 60 cards. Record a different subtraction fact on each card from the Subtraction Cards for Small Numbers 1–6 Masters. Keep the cards sorted by group (e.g., Group 1 corresponds to the Subtraction Cards for Small Numbers 1 Master). See Figure 1.
Figure 1: Prepared Show Your Strategy Card
TIMS Tip
If you have a small class, record only some of the subtraction problems. Choose facts that lend themselves to different counting and reasoning strategies.
Prepare Materials for Learning Centers. Students will have access to several different learning center activities in this lesson. Make a sign to identify each center activity. Decide how many students will visit a center at one time and prepare the following materials for each activity accordingly and place them in a learning center.
- Counting Strategies: connecting cubes and the Counting Strategies page students will bring from their Student Activity Book.
- Use Other Facts: connecting cubes and the Use Other Facts: Small Numbers or Use Other Facts: Larger Numbers pages students will bring from their Student Activity Book.
- Play Ten Frame Flash: Subtract from Ten: several sets of the cards on the 0–10 Small Ten Frame Cards Masters copied, cut apart, and stored in envelopes.
- Play Minus Five: several sets of the cards on the 11–20 Ten Frame Flash Cards Masters copied, cut apart, and stored in envelopes.
Assessment in this Lesson
| Assessment | Expectation Assessed |
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Subtraction Practice Menu |
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Counting Strategies |
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Use Other Facts: Small Numbers |
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Use Other Facts: Larger Numbers |
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