Study guide: Count Objects to Twenty and Number Sequences to One Hundred
Track every object once in groups through twenty and continue number sequences through one hundred.
Ideas to explain in your own words
- A line can hold more objects than you can notice at a glance.
- You do not always need to start at one.
- A circle has no natural first or last object.
- A numeral can tell you how many objects to make.
Useful vocabulary
- count
- Give each object one number word.
- total
- How many objects are in the whole group.
Watch your reasoning
- Do not count the same dot again just because it is near another dot.
- The starting number is not a new step.
- Stop before counting the first dot again.
- A requested group is exact; do not add an extra mark after reaching the number.
A worked review example
Draw 11 dots in a line. Touch them in order while saying one through eleven. The eleventh touch finishes the count, so the total is 11. Counting from the other end still reaches eleven because no dot was added or removed. Use a small circle to show a dot has been counted. Do not count the same dot again just because it is near another dot. Draw one dot for each object and circle them one at a time.
Make a practice plan
- Keep Your Place in a Longer Line: Make a line of 19 dots. Expected: 19, regardless of which end you start at.
- Start Counting from a Given Number: With adult read-aloud support, count by tens: 10,20,30,40,50,60,70,80,90,100. Then count from 95: 96,97,98,99,100. Expected: stop at one hundred with the stated steps.
- Count a Circle Without Going Around Twice: Draw 17 dots in a ring and recount in the opposite direction. Expected: 17 both ways.
- Make Exactly the Requested Group: Make groups for cards 12 and 20. Expected: separate drawings with exactly 12 and 20 marks.