Cogito
Grade 1 Math · Chapter 1 · Lesson 3
Number Bonds
Show two parts that make one whole.
7 problems · about 11 minutes · 1.OA.A.1, 1.OA.B.3
What this lesson teaches
The child records a set of objects as a number bond with a whole and two parts, and recognises that one set can produce several different bonds.
- A whole can be split into two parts.
- A number bond shows the whole and both parts.
- One group can be split in more than one way.
Warm-Up Review
From earlier lessons. Loosen up before the new work.
4 problemsReview — 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 — 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 problemsThe whole is 6. One part is 2. What is the other part?
Answer 4
Why 2 and 4 make 6.
Look at the trays. What is the whole?
Answer 7
Why 3 and 4 make 7, so the whole is 7.
Stretch Yourself
Mixed problems. Work out what kind of question it is before you start.
1 problemSnack Time: Mia has 7 grapes. She eats 3. How many are left?
Answer 4 grapes
Why The whole is 7 and one part is 3, so the other part is 4.