Cogito
Grade 2 Math · Chapter 3 · Lesson 4
Counting to 1,000
Crossing each hundred is the only tricky bit.
10 problems · about 12 minutes · 2.NBT.A.2
What this lesson teaches
The child counts within 1,000 across hundreds boundaries.
- Counting to 1,000 repeats the same pattern.
- After 199 comes 200, because the hundred fills up.
- Most of the time only the ones digit changes.
Warm-Up Review
From earlier lessons. Loosen up before the new work.
2 problemsReview — Skip-Counting by 5s, 10s, and 100s: Counting by 5s: 40, 45, ?
Answer 50
Why 45 and 5 more is 50.
Review — Building Numbers to 1,000: 6 hundreds, 0 tens and 3 ones is which number?
Answer 603
Why 603 has no tens.
Warm Up
Straightforward practice. Get the method working first.
4 problemsWhat comes after 499?
Answer 500
Why After 499 comes 500.
What comes after 250?
Answer 251
Why After 250 comes 251.
What comes after 399?
Answer 400
Why A new hundred starts.
What comes after 509?
Answer 510
Why Just a new ten.
Build It Up
The same ideas with more to keep track of.
2 problemsWhat comes after 799?
Answer 800
Why Both the ones and the tens roll over.
What comes before 700?
Answer 699
Why Count back one.
Stretch Yourself
Mixed problems. Work out what kind of question it is before you start.
2 problemsCounting Steps: Ana has counted 299 steps. What is the next number?
Answer 300
Why After 299 comes 300.
Nearly There: A counter shows 649. What comes next?
Answer 650
Why After 649 comes 650.