Cogito
Grade 1 Math · Chapter 4 · Lesson 7
Counting to Twenty and Back
Start anywhere and keep going, forwards or backwards.
10 problems · about 11 minutes · 1.NBT.A.1
What this lesson teaches
The child counts forward and backward from any number within 20.
- You can start counting from any number.
- You can count forwards or backwards.
- Say each number as you go.
Warm-Up Review
From earlier lessons. Loosen up before the new work.
4 problemsReview — One More, One Less to Twenty: One more than 11?
Answer 12
Why One more than 11 is 12.
Review — Breaking Teen Numbers Apart: 12 is 10 and what?
Answer 2
Why 12 is 10 and 2.
Review — Writing Teen Numbers: In 16, how many ones are there?
Answer 6
Why 16 is one ten and 6 ones.
Review — Saying It the Ten Way: Ten five is which number?
Answer 15
Why Ten five is fifteen.
Warm Up
Straightforward practice. Get the method working first.
3 problemsWhat comes after 18?
Answer 19
Why 19 comes after 18.
Count back 1 from 12.
Answer 11
Why 11 comes before 12.
Count on 2 from 16. Where do you land?
Answer 18
Why Seventeen, eighteen.
Build It Up
The same ideas with more to keep track of.
1 problemCount back 2 from 15. Where do you land?
Answer 13
Why Fourteen, thirteen.
Stretch Yourself
Mixed problems. Work out what kind of question it is before you start.
2 problemsCount on 3 from 11. Where do you land?
Answer 14
Why Twelve, thirteen, fourteen.
Countdown: Ben counts back from 14. What number comes after 13?
Answer 12
Why Counting back from 13 gives 12.