Cogito
Grade 1 Math · Chapter 1 · Lesson 4
All the Ways to Make 6 and 7
Find every pair of parts that makes 6 or 7.
9 problems · about 13 minutes · 1.OA.B.3, 1.OA.C.6
What this lesson teaches
The child finds every decomposition of 6 and 7 and notices the staircase pattern in the ordered list.
- A number can be split many ways.
- Going in order helps you find them all.
- 2 and 4 makes 6, and so does 4 and 2.
Warm-Up Review
From earlier lessons. Loosen up before the new work.
6 problemsReview — 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 — 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.
Review — See It Fast: How many dots? Try to see it without counting.
Answer 5
Why A full row of 5 is a shape worth knowing. It shows up everywhere.
Warm Up
Straightforward practice. Get the method working first.
2 problems4 and what make 6?
Answer 2
Why 4 and 2 make 6.
3 and what make 7?
Answer 4
Why 3 and 4 make 7.
Stretch Yourself
Mixed problems. Work out what kind of question it is before you start.
1 problemTwo Pockets: Sam has 7 marbles in two pockets. One pocket has 5. How many are in the other?
Answer 2 marbles
Why 5 and 2 make 7.