Cogito
Grade 1 Math · Chapter 4 · Lesson 1
Ten Ones Make One Ten
Bundle ten little ones into one big ten.
10 problems · about 11 minutes · 1.NBT.B.2.a
What this lesson teaches
The child bundles ten ones into a single ten and describes the result as one unit.
- Ten ones can be bundled into one ten.
- It is still the same amount.
- Counting tens is faster than counting ones.
Warm-Up Review
From earlier lessons. Loosen up before the new work.
7 problemsReview — Adding and Subtracting to Ten: 7 − 2 = ?
Answer 5
Why 7 − 2 = 5.
Review — Subtracting From Ten: 10 − 6 = ?
Answer 4
Why 10 − 6 = 4.
Review — Taking Nothing and Taking All: 10 − 10 = ?
Answer 0
Why Take all away and none are left.
Review — Fact Families: You know 4 + 5 = 9. What is 9 − 4?
Answer 5
Why Same fact, read the other way.
Review — What Changed?: 9 − ? = 6
Answer 3
Why 9 − 3 = 6.
Review — The Hidden Part: Whole 9, one part 4. What is the other part?
Answer 5
Why 4 + 5 = 9.
Review — Taking Away: 7 − 3 = ?
Answer 4
Why 7 − 3 = 4.
Warm Up
Straightforward practice. Get the method working first.
2 problemsHow many ones are in one ten?
Answer 10
Why One ten is made of ten ones.
You bundle ten ones. Do you have more, less, or the same?
Answer The same amount.
Why Bundling changes how it looks, not how much there is.
Stretch Yourself
Mixed problems. Work out what kind of question it is before you start.
1 problemPencil Pots: Mia has one full ten of pencils and no loose ones. How many pencils?
Answer 10 pencils
Why One ten is 10.