Parent guide · Grade 1 Math · Unit 4

Lesson 4.3 Part-Part-Whole Pictures

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 20–25 minutes
Goal: Draw a bar model for a story.
You need: Pencil and crayons
A King James Bible
Print: Worksheet A · Worksheet B · the lesson page (it also has a short video (8:04))

Steps

Warm-up
Do this: Ask these out loud. Your child answers out loud; no paper needed.
- Ask: “8 + 5” Listen for: 13
- Ask: “7 + 8” Listen for: 15
- Ask: “7 + 2” Listen for: 9
- Ask: “1 + 4” Listen for: 5
- Ask: “6 + 8” Listen for: 14
Teach the new idea
Say this: “A bar model shows the whole as one long bar split into parts.”
Say this: “If both parts are known, add to find the whole. If the whole and one part are known, subtract.”
Say this: “Bar model: a drawing of bars that shows parts and a whole.”
Show how
Show: A Roman legion marched 4 miles one week and 12 miles the next. How far did it march?
$bar model$
Say this: “Unknown: the total.”
Say this: “Bar model: two parts, 4 and 12; the whole is unknown.”
Say this: “Equation: 4 + 12 = ?”
Say this: “4 + 12 = 16”
Say this: “Answer: It marched 16 miles.”
Answer: 16 miles. It marched 16 miles.
Show: Find the missing number: ___ + 5 = 12
Say this: “Think: what goes with 5 to make 12?”
Say this: “12 − 5 = 7”
Say this: “Check: 7 + 5 = 12”
Answer: 7
Practice together
Do this: Your child does these with you. Let them try first; help only after a real try.
Ask: Number bond: 12 is 2 and ___.
$bar model$
Listen for: 10
If stuck: 2 + ___ = 12
Ask: Number bond: 15 is 15 and ___.
$bar model$
Listen for: 0
If stuck: 15 + ___ = 15
Ask: Number bond: 16 is 8 and ___.
$bar model$
Listen for: 8
If stuck: 8 + ___ = 16
7 more practice items on the lesson page, and on Worksheet A and Worksheet B.
Watch for
- Putting the whole in a part box.
Game: Story Swap
You give a number sentence like 9 − 4 = 5. Your child tells a farm or Bible story that fits it. Then swap.
Narration
Say this: “Tell me what you learned today. Show me with your hands or the counters if you like.”
Listen for: Draw a bar model for a story.
Daily habit
Tell one story problem aloud every day at a meal: “There were 7 rolls and Father ate 2…”

Spread over the week

5 sessions of 20–25 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.