Cogito
Grade 1 Math · Chapter 1 · Lesson 5
All the Ways to Make 8 and 9
Find every pair of parts that makes 8 or 9.
10 problems · about 13 minutes · 1.OA.B.3, 1.OA.C.6
What this lesson teaches
The child finds every decomposition of 8 and 9 and uses the five-structure of the ten-frame to see those splits faster.
- 8 and 9 split many ways too.
- The top row of five helps you see the split.
- Go in order and you will find them all.
Warm-Up Review
From earlier lessons. Loosen up before the new work.
7 problemsReview — All the Ways to Make 6 and 7: 4 and what make 6?
Answer 2
Why 4 and 2 make 6.
Review — Number Bonds: The whole is 6. One part is 2. What is the other part?
Answer 4
Why 2 and 4 make 6.
Review — Five and Some More: A full five and 3 more. How many is that?
Answer 8
Why Five and 3 make 8.
Review — See It Fast: Which picture shows 4, arranged so it is easy to see fast?
Answer A dice pattern showing four dots
Why Both show 4! The dice pattern is easier to see fast because it has a shape you know.
Review — All the Ways to Make 6 and 7: 3 and what make 7?
Answer 4
Why 3 and 4 make 7.
Review — Number Bonds: Look at the trays. What is the whole?
Answer 7
Why 3 and 4 make 7, so the whole is 7.
Review — Five and Some More: How many beads?
Answer 6
Why Five and 1 make 6.
Warm Up
Straightforward practice. Get the method working first.
2 problems5 and what make 8?
Answer 3
Why 5 and 3 make 8.
6 and what make 9?
Answer 3
Why 6 and 3 make 9.
Stretch Yourself
Mixed problems. Work out what kind of question it is before you start.
1 problemIn the Garden: There are 8 flowers. 5 are red. How many are not red?
Answer 3 flowers
Why 5 and 3 make 8.