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Parent guide · Grade 3 Math · Unit 4

Lesson 4.3 Dividing with 2, 5, 10

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 25–30 minutes
Goal
Divide by 2, 5 and 10.
You need
  • Counters (dried beans, buttons or pebbles)
  • A few cups
  • Pencil and crayons
Print
Worksheet A · Worksheet B · the lesson page (it also has a short video (3:14))

Steps

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

    • Ask: “2 × 4” Listen for: 8
    • Ask: “6 × 10” Listen for: 60
    • Ask: “8 × 3” Listen for: 24
    • Ask: “9 × 2” Listen for: 18
    • Ask: “9 × 3” Listen for: 27

  2. Say this: “To divide by 2, find half. To divide by 10, ask how many tens.”

    Say this: “Think: 5 × ___ = 35.”

    Say this: “Dividend: the number being divided.”

    Say this: “Divisor: the number you divide by.”

  3. Show: 45 ÷ 5 = ___

    Say this: “Think multiplication: 5 × ___ = 45”

    Say this: “5 × 9 = 45”

    Answer: 9

    Show: A weaver has 18 feet of cloth. She cuts it into pieces 2 feet long. How many pieces does she get?

    bar model

    Say this: “Unknown: the size of each group.”

    Say this: “Bar model: the whole is 18, cut into 2 equal parts.”

    Say this: “Equation: 18 ÷ 2 = ?”

    Say this: “18 ÷ 2 = 9”

    Say this: “Answer: She gets 9 pieces.”

    Answer: 9 pieces. She gets 9 pieces.

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

    Ask: 30 ÷ 10 = ___

    Listen for: 3

    If stuck: Think multiplication: 10 × ___ = 30

    Ask: 20 ÷ 2 = ___

    Listen for: 10

    If stuck: Think multiplication: 2 × ___ = 20

    Ask: 80 ÷ 10 = ___

    Listen for: 8

    If stuck: Think multiplication: 10 × ___ = 80

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

    • Writing the divisor as the answer.

  6. Count out 12 to 40 beans and a number of cups. Share the beans equally. Say the division fact and the matching multiplication fact.

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

    Listen for: Divide by 2, 5 and 10.

  8. Say the multiplication facts of 2, 3, 4, 5 and 10 as division facts.

Spread over the week

5 sessions of 25–30 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.