Parent guide · Grade 2 Math · Unit 2

Lesson 2.4 Skip Counting by 5, 10, 100

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: Skip count by 5s, 10s and 100s.
You need: Pencil and crayons
Print: Worksheet A · Worksheet B · the lesson page (it also has a short video (2:05))

Steps

Warm-up
Do this: Ask these out loud. Your child answers out loud; no paper needed.
- Ask: “What number is one hundred less than 302?” Listen for: 202
- Ask: “What number is one hundred more than 497?” Listen for: 597
- Ask: “What number is one hundred less than 273?” Listen for: 173
- Ask: “What number is one hundred more than 640?” Listen for: 740
- Ask: “What number is one hundred more than 366?” Listen for: 466
Teach the new idea
Say this: “Counting by tens from 47: 57, 67, 77. Only the tens digit changes.”
Say this: “Counting by hundreds from 230: 330, 430. Only the hundreds digit changes.”
Say this: “Skip count: count by a number other than 1.”
Show how
Show: Fill in the missing number: 287, 297, 307, 317, ___
Say this: “The numbers go up by 10 each time.”
Say this: “317 + 10 = 327”
Answer: 327
Show: Fill in the missing number: 183, 283, ___, 483, 583
Say this: “The numbers go up by 100 each time.”
Say this: “283 + 100 = 383”
Answer: 383
Practice together
Do this: Your child does these with you. Let them try first; help only after a real try.
Ask: Fill in the missing number: 72, 77, ___, 87, 92
Listen for: 82
If stuck: The numbers go up by 5 each time.
Ask: Fill in the missing number: 14, 19, ___, 29, 34
Listen for: 24
If stuck: The numbers go up by 5 each time.
Ask: Fill in the missing number: 10, 15, ___, 25, 30
Listen for: 20
If stuck: The numbers go up by 5 each time.
7 more practice items on the lesson page, and on Worksheet A and Worksheet B.
Watch for
- Changing the wrong digit.
Game: Biggest Number
Each player draws three digit cards and arranges them to make the biggest number possible. Read it aloud. Biggest number wins.
Narration
Say this: “Tell me what you learned today. Show me with your hands or the counters if you like.”
Listen for: Skip count by 5s, 10s and 100s.
Daily habit
Count by hundreds to 1,000, by tens from any number, and by fives to 100.

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.