Cogito
Kindergarten Math · Chapter 7 · Lesson 2
Counting by Tens
Ten, twenty, thirty, jumping along.
10 problems · about 8 minutes · K.CC.A.1
What this lesson teaches
The child counts to 100 by tens.
- Counting by tens jumps ten at a time.
- Ten tens make a hundred.
- The tens make a straight column on the chart.
Warm-Up Review
From earlier lessons. Loosen up before the new work.
4 problemsReview — Counting by Ones to a Hundred: What comes after 49?
Answer 50
Why Fifty.
Review — Comparing Teen Numbers: Which is bigger, 14 or 18?
Answer 18
Why Eighteen.
Review — Building Teen Numbers: 10 + 5 = ?
Answer 15
Why Fifteen.
Review — Ten and Some More: 18 is 10 and how many?
Answer 8
Why Eight.
Warm Up
Straightforward practice. Get the method working first.
3 problemsFive bundles of ten. How many?
Answer 50
Why Fifty.
What comes after 30 when counting by tens?
Answer 40
Why Forty.
What comes after 70 when counting by tens?
Answer 80
Why Eighty.
Build It Up
The same ideas with more to keep track of.
2 problemsHow many tens make a hundred?
Answer 10
Why Count the jumps.
Six bundles of ten. How many?
Answer 60
Why Sixty.
Stretch Yourself
Mixed problems. Work out what kind of question it is before you start.
1 problemThe Bundles: Four bundles of ten straws. How many straws?
Answer 40
Why Forty.