Count with ten strips to 100
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Count with ten strips to 100: skill guide
| Objective | Quantities from 20 through 100 appear as stacked ten strips. |
|---|---|
| Grade | Kindergarten |
| Standard | CCSS.MATH.CONTENT.K.CC.A.1 |
| Difficulty | Foundational · Mixed |
| Representation | Ten strip, Number sequence |
| Practice format | Interactive, account-free practice with immediate feedback |
Objective
Quantities from 20 through 100 appear as stacked ten strips.
What this practice covers
Quantities from 20 through 100 appear as stacked ten strips. Learners count full strips by tens and add the dots in the final partial strip.
Standards alignment
Supports Common Core: CCSS.MATH.CONTENT.K.CC.A.1 — Count to 100 by ones and by tens.
Who it’s for
This practice is for kindergarten and Grade 1 learners who count confidently through 20 and are ready to extend the same patterns through 100. The visual structure keeps tens visible while learners work with larger numerals.
What to know first
- Learners should recognize numerals through 20, count forward one number at a time, and understand that a full ten strip represents one group of ten.
Difficulty and scaffolding
Foundational · Mixed stage
Problem representations
- Ten strip
- Number sequence
Three worked examples
- Two full strips show 20.
- Four full strips and 3 dots show 43.
- Nine full strips and 7 dots show 97.
Likely misconceptions
- Common mistakes include skipping a decade while counting the full strips by tens, or counting an incomplete strip as a full ten. Encourage learners to count the full strips by tens first, then count on the leftover dots by ones.
Hints and explanations
- Two full strips show 20.
- Four full strips and 3 dots show 43.
- Nine full strips and 7 dots show 97.
What to practice next
Next, Count by 10 asks for the missing multiples of ten in a row from 10 to 100.
Editorial review
Reviewed by Brilliant’s curriculum team. Exercises are generated within defined difficulty ranges and checked against verified answer rules.
Count with ten strips to 100 FAQs
What is the thicker line in the middle of each strip?
It marks the halfway point after five cells. Learners can use it to read the dots in a partial strip, such as 5 and 2 more for 7, without counting each dot.
Should this practice be timed?
No. Accuracy and noticing structure matter more than speed. Fluency usually develops naturally after learners repeatedly connect a numeral to its place in a sequence or to groups of ten.
How can ten strips help with larger numbers?
Each full strip is one group of ten. Learners can count the full strips by tens and then count the dots in the final partial strip by ones.
What should learners practice next?
Continue with place value, counting by tens, and addition or subtraction across a decade. These activities all build on seeing a two-digit number as tens and ones.