Cogito
Grade 1 Math · Chapter 2 · Lesson 9
Facts to Ten
Put every strategy together and spot the patterns.
10 problems · about 13 minutes · 1.OA.C.6, 1.OA.B.3
What this lesson teaches
The child works fluently across addition facts within 10 and finds the same-total pattern in an addition chart.
- You can add in more than one way.
- Sums with the same total make a stripe on the chart.
- Pick whichever way is quickest for you.
Warm-Up Review
From earlier lessons. Loosen up before the new work.
1 problemReview — Doubles and One More: 3 + 4 = ?
Answer 7
Why 3 + 3 = 6, and one more is 7.
Warm Up
Straightforward practice. Get the method working first.
5 problems7 + 3 = ?
Answer 10
Why 7 + 3 = 10.
2 + 2 = ?
Answer 4
Why 2 + 2 = 4.
6 + ? = 9
Answer 3
Why 6 + 3 = 9.
2 + 7 = ?
Answer 9
Why Swap it: think 7 + 2.
3 + 3 = ?
Answer 6
Why A double.
Build It Up
The same ideas with more to keep track of.
2 problems5 + ? = 10
Answer 5
Why A double, and a partner to ten.
4 + 5 = ?
Answer 9
Why 4 + 4, then one more.
Stretch Yourself
Mixed problems. Work out what kind of question it is before you start.
2 problemsThe Party: There are 6 girls and 3 boys at a party. How many children in all?
Answer 9 children
Why 6 + 3 = 9.
The Fish Tank: A tank has 4 orange fish and 4 blue fish. How many fish in all?
Answer 8 fish
Why 4 + 4 = 8.