Count by 10
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Count by 10: skill guide
| Objective | Learners complete sequences of multiples of ten. |
|---|---|
| Grade | Kindergarten |
| Standard | CCSS.MATH.CONTENT.K.CC.A.1 |
| Difficulty | Foundational · Abstract |
| Representation | Number sequence |
| Practice format | Interactive, account-free practice with immediate feedback |
Objective
Learners complete sequences of multiples of ten.
What this practice covers
Learners complete sequences of multiples of ten. In 15-question Practice mode, the first eight problems contain one blank; later problems contain two to five blanks and may count backward from 100. The 5-question Quick Check samples from the same progression.
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 · Abstract stage
Problem representations
- Number sequence
Three worked examples
- 10, 20, __, 40 is completed with 30.
- 60, __, 80 is completed with 70.
- 100, 90, __, 70 is completed with 80.
Likely misconceptions
- Common mistakes include skipping a decade number, such as going from 40 to 60, or counting forward in a row that counts backward from 100. Encourage learners to say each ten aloud and to check which way the row is going.
Hints and explanations
- 10, 20, __, 40 is completed with 30.
- 60, __, 80 is completed with 70.
- 100, 90, __, 70 is completed with 80.
What to practice next
Grade 1 begins with Count backward, which asks for missing numbers in rows that count down by ones, such as 40 down to 31. Counting by tens returns in Grade 1 when learners add 10 and multiples of 10.
Editorial review
Reviewed by Brilliant’s curriculum team. Exercises are generated within defined difficulty ranges and checked against verified answer rules.
Count by 10 FAQs
Why practice one row at a time?
The row holds every multiple of ten from 10 to 100. Seeing them together shows that each step adds or takes away one ten, and every number ends in 0. It is the last column of a hundred chart, laid out as a row.
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.
Does the count always go up?
No. Later problems may count backward from 100 to 10. The first and last numbers in a row are always shown, so learners can compare them to see which way the row goes.
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.