Parent guide · Kindergarten Math · Unit 9

Lesson 9.2 Adding and Taking Away

Written for the parent. Read the Say this lines aloud as they are, or in your own words. Answers for you are marked Listen for.

At a glance

Time: 5 sessions of 15–20 minutes
Goal: Review addition and subtraction within 10.
You need: Craft sticks and rubber bands
Pencil and crayons
Print: Worksheet A · Worksheet B · the lesson page

Steps

Warm-up
Do this: Ask these out loud. Your child answers out loud; no paper needed.
- Ask: “2 + 5” Listen for: 7
- Ask: “2 + 1” Listen for: 3
- Ask: “0 + 4” Listen for: 4
- Ask: “3 + 3” Listen for: 6
- Ask: “4 + 2” Listen for: 6
Teach the new idea
Say this: “Add to put together; subtract to take away.”
Say this: “Fact families link them.”
Show how
Show: 5 − 2 = ___
Say this: “Start at 5 and count back 2: 4, 3.”
Say this: “5 − 2 = 3”
Answer: 3
Show: The baker made 3 rolls and 4 loaves. How many pieces of bread did she make?
$bar model$
Say this: “Unknown: the total.”
Say this: “Bar model: two parts, 3 and 4; the whole is unknown.”
Say this: “Equation: 3 + 4 = ?”
Say this: “3 + 4 = 7”
Say this: “Answer: She made 7 pieces of bread.”
Answer: 7 pieces. She made 7 pieces of bread.
Practice together
Do this: Your child does these with you. Let them try first; help only after a real try.
Ask: 3 + 1 = ___
Listen for: 4
If stuck: Start at 3 and count on 1: 4.
Ask: 2 + 1 = ___
Listen for: 3
If stuck: Start at 2 and count on 1: 3.
Ask: 3 + 3 = ___
Listen for: 6
If stuck: This is a double: 3 + 3 = 6
7 more practice items on the lesson page, and on Worksheet A and Worksheet B.
Watch for
- Mixing up + and −.
Game: Math Bingo
Make a 3 × 3 grid of numbers 0–10. Call out problems like “3 + 4” or “one less than 6.” Your child covers the answers. Three in a row wins.
Narration
Say this: “Tell me what you learned today. Show me with your hands or the counters if you like.”
Listen for: Review addition and subtraction within 10.
Daily habit
Mix all the counting chants: by ones to 100, by tens, by fives, and back from 20.

Spread over the week

5 sessions of 15–20 minutes. Stop while it is still going well.

Session 1. Warm-up, then teach the new idea (steps 1 and 2).
Session 2. Warm-up again, then show how with the examples.
Session 3. Practice together, then play the game.
Session 4. More practice on the worksheet, and the daily habit.
Session 5. Quick check: narration and a few practice items. Move on when it is mostly right.