Parent guide · Grade 3 Math · Unit 3

Lesson 3.2 Facts of 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: Know the 2s, 5s and 10s facts.
You need: Counters (dried beans, buttons or pebbles)
Dice
Pencil and crayons
Print: Worksheet A · Worksheet B · the lesson page (it also has a short video (4:10))

Steps

Warm-up
Do this: Ask these out loud. Your child answers out loud; no paper needed.
- Ask: “5 × 2” Listen for: 10
- Ask: “10 × 6” Listen for: 60
- Ask: “8 × 2” Listen for: 16
- Ask: “7 × 5” Listen for: 35
- Ask: “5 × 7” Listen for: 35
Teach the new idea
Say this: “The 2s are doubles. The 5s end in 0 or 5. The 10s end in 0.”
Say this: “Half of a 10s fact is the 5s fact: 10 × 7 = 70, so 5 × 7 = 35.”
Say this: “Multiple: a number you say when skip counting.”
Show how
Show: 6 × 5 = ___
Say this: “Fives: half of tens. 6 × 10 = 60”
Say this: “60 ÷ 2 = 30”
Answer: 30
Show: There are 8 rows in the garden with 8 cabbages in each row. How many cabbages are there?
$bar model$
Say this: “Unknown: the total.”
Say this: “Bar model: 8 equal parts of 8; the whole is unknown.”
Say this: “Equation: 8 × 8 = ?”
Say this: “8 × 8 = 64”
Say this: “Answer: There are 64 cabbages.”
Answer: 64 cabbages. There are 64 cabbages.
Practice together
Do this: Your child does these with you. Let them try first; help only after a real try.
Ask: 2 × 10 = ___
Listen for: 20
If stuck: Twos are doubles: 10 + 10 = 20
Ask: 10 × 7 = ___
Listen for: 70
If stuck: 10 × 7 = 70
Ask: 2 × 4 = ___
Listen for: 8
If stuck: Fours: double, then double again. 2 × 2 = 4
7 more practice items on the lesson page, and on Worksheet A and Worksheet B.
Watch for
- Mixing up 5 × 7 and 5 + 7.
Game: Array Builders
Roll two dice. Build that many rows and columns with beans or buttons, then say the fact: “4 rows of 6 is 24.” Keep a tally of facts you know instantly.
Narration
Say this: “Tell me what you learned today. Show me with your hands or the counters if you like.”
Listen for: Know the 2s, 5s and 10s facts.
Daily habit
Skip count by 2s, 5s, 10s, 3s and 4s to the tenth multiple. Fact drill (one minute) on Fridays.

Spread over the week

5 sessions of 25–30 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.