School Launch

Parent guide · Grade 1 Math · Unit 5

Lesson 5.4 10 More, 10 Less

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
Find 10 more and 10 less without counting.
You need
  • The hundred chart (printables pack)
  • Craft sticks and rubber bands
  • Dice
  • Pencil and crayons
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: “What number is ten less than 33?” Listen for: 23
    • Ask: “What number is ten more than 42?” Listen for: 52
    • Ask: “What number is ten less than 34?” Listen for: 24
    • Ask: “What number is ten less than 65?” Listen for: 55
    • Ask: “What number is ten less than 44?” Listen for: 34

  2. Say this: “10 more than 46 is 56: the tens digit goes up one and the ones stay the same.”

    Say this: “On the hundred chart, 10 more is the number just below.”

    Say this: “10 more: one more ten; the tens digit goes up by 1.”

  3. Show: What number is ten less than 56?

    Say this: “56 − 10 = 46”

    Answer: 46

    Show: Fill in the missing number: 8, 18, 28, 38, ___

    Say this: “The numbers go up by 10 each time.”

    Say this: “38 + 10 = 48”

    Answer: 48

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

    Ask: What number is ten more than 36?

    Listen for: 46

    If stuck: 36 + 10 = 46

    Ask: What number is ten more than 60?

    Listen for: 70

    If stuck: 60 + 10 = 70

    Ask: What number is ten more than 39?

    Listen for: 49

    If stuck: 39 + 10 = 49

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

    • Changing the ones digit.

  6. Roll two dice and take that many sticks. Each time you have ten, bundle them with a rubber band. First to 100 (ten bundles) wins.

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

    Listen for: Find 10 more and 10 less without counting.

  8. Count to 120 by tens and by ones. Count by tens starting from any number: 7, 17, 27 …

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.