Parent guide · Grade 1 Math · Unit 6
Lesson 6.1 Adding Tens
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
- Add multiples of 10.
- You need
- A few real coins
- Pencil and crayons
- A King James Bible
- Worksheet A · Worksheet B · the lesson page (it also has a short video (6:19))
Steps
Do this: Ask these out loud. Your child answers out loud; no paper needed.
- Ask: “7 + 8” Listen for: 15
- Ask: “2 + 3” Listen for: 5
- Ask: “1 + 7” Listen for: 8
- Ask: “8 + 4” Listen for: 12
- Ask: “6 + 5” Listen for: 11
Say this: “3 tens + 4 tens = 7 tens, so 30 + 40 = 70.”
Say this: “Adding tens is like adding ones, but with tens.”
Say this: “Multiple of ten: a number like 10, 20, 30 ….”
Show: 40 + 50 = ___
Say this: “Add the tens: 40 + 50 = 90”
Answer: 90
Show: A Roman legion marched 39 miles one week and 30 miles the next. How far did it march?
Say this: “Unknown: the total.”
Say this: “Bar model: two parts, 39 and 30; the whole is unknown.”
Say this: “Equation: 39 + 30 = ?”
Say this: “39 + 30 = 69”
Say this: “Answer: It marched 69 miles.”
Answer: 69 miles. It marched 69 miles.
Do this: Your child does these with you. Let them try first; help only after a real try.
Ask: 4 + 4 = ___
Listen for: 8
If stuck: This is a double: 4 + 4 = 8
Ask: 5 + 2 = ___
Listen for: 7
If stuck: Start at 5 and count on 2: 6, 7.
Ask: 40 + 40 = ___
Listen for: 80
If stuck: Add the tens: 40 + 40 = 80
7 more practice items on the lesson page, and on Worksheet A and Worksheet B.
- Writing 7 instead of 70.
Price toys at 10¢, 20¢ … 90¢. Your child pays with dimes and says the total of two toys, then the change from $1.
Say this: “Tell me what you learned today. Show me with your hands or the counters if you like.”
Listen for: Add multiples of 10.
But other fell into good ground, and brought forth fruit, some an hundredfold, some sixtyfold, some thirtyfold.
Thirty, sixty, a hundred: tens grow quickly. Good soil bears much fruit.
Count by tens from any number: 3, 13, 23 … and back down.
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.