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Parent guide · Grade 2 Math · Unit 9

Lesson 9.1 Regrouping Review

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
Review adding and subtracting with regrouping.
You need
  • Pencil and crayons
  • A King James Bible
Print
Worksheet A · Worksheet B · the lesson page

Steps

  1. Do this: Ask these out loud. Your child answers out loud; no paper needed.

    • Ask: “3 + 6” Listen for: 9
    • Ask: “5 + 2” Listen for: 7
    • Ask: “9 + 2” Listen for: 11
    • Ask: “6 + 2” Listen for: 8
    • Ask: “6 + 4” Listen for: 10

  2. Say this: “Line up places and start with the ones.”

    Say this: “Check subtraction by adding.”

  3. Show: 781 − 214 = ___

    Say this: “Ones: 1 is less than 4, so regroup 1 ten as 10 ones. The tens digit becomes 7.”

    Say this: “11 − 4 = 7”

    Say this: “Tens: 7 − 1 = 6”

    Say this: “Hundreds: 7 − 2 = 5”

    Say this: “Check: 567 + 214 = 781”

    Answer: 567

    Show: 705 − 355 = ___

    Say this: “Ones: 5 − 5 = 0”

    Say this: “Tens: 0 is less than 5, so regroup 1 hundred as 10 tens. The hundreds digit becomes 6.”

    Say this: “10 − 5 = 5”

    Say this: “Hundreds: 6 − 3 = 3”

    Say this: “Check: 350 + 355 = 705”

    Answer: 350

  4. Do this: Your child does these with you. Let them try first; help only after a real try.

    Ask: 129 + 446 = ___

    Listen for: 575

    If stuck: Ones: 9 + 6 = 15. Write 5 and regroup 1 to the tens.

    Ask: 336 + 266 = ___

    Listen for: 602

    If stuck: Ones: 6 + 6 = 12. Write 2 and regroup 1 to the tens.

    Ask: 266 + 358 = ___

    Listen for: 624

    If stuck: Ones: 6 + 8 = 14. Write 4 and regroup 1 to the tens.

    7 more practice items on the lesson page, and on Worksheet A and Worksheet B.

    • Forgetting a regrouped digit.

  6. Write ten problems on cards around the house. Your child runs to each card, solves it and brings it back. Time the round; try to beat it.

  7. Say this: “Tell me what you learned today. Show me with your hands or the counters if you like.”

    Listen for: Review adding and subtracting with regrouping.

  8. To every thing there is a season, and a time to every purpose under the heaven:

    Ecclesiastes 3:1 (KJV)

    Review brings the year to a good close.

  9. Mixed fact drill daily. Count by 5s, 10s, 25s and 100s.

Spread over the week

5 sessions of 20–25 minutes. Stop while it is still going well.

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