Count backward
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Count backward: skill guide
| Objective | Learners fill missing numerals in sequences that move backward by one. |
|---|---|
| Grade | Grade 1 |
| Standard | CCSS.MATH.CONTENT.1.OA.C.5 |
| Difficulty | Developing · Abstract |
| Representation | Number sequence |
| Practice format | Interactive, account-free practice with immediate feedback |
Objective
Learners fill missing numerals in sequences that move backward by one.
What this practice covers
Learners fill missing numerals in sequences that move backward by one. The rows begin predictably and then include several missing values.
Standards alignment
Prepares for Common Core: CCSS.MATH.CONTENT.1.OA.C.5 — Relate counting to addition and subtraction.
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
Developing · Abstract stage
Problem representations
- Number sequence
Three worked examples
- 30, 29, __, 27 is completed with 28.
- 50, __, 48 is completed with 49.
- 75, 74, __, __, 71 needs 73 and 72.
Likely misconceptions
- Common mistakes include counting forward instead of backward, or writing the wrong tens digit right after the first number, such as 59 or 40 after 50 instead of 49. Encourage learners to name the tens first, then check the ones.
Hints and explanations
- 30, 29, __, 27 is completed with 28.
- 50, __, 48 is completed with 49.
- 75, 74, __, __, 71 needs 73 and 72.
What to practice next
Mix forward and backward sequences, including partial rows that do not begin at a decade.
Editorial review
Reviewed by Brilliant’s curriculum team. Exercises are generated within defined difficulty ranges and checked against verified answer rules.
Count backward FAQs
Why practice one row at a time?
A short row keeps attention on the repeating ones pattern and the change at each new decade. It gives learners the benefit of a hundred chart without the visual load of all one hundred squares.
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.
Why does each row start at a multiple of ten?
Each row is one row of a hundred chart read backward, such as 40 down to 31. The first step back, from 40 to 39, changes the tens digit. After that, only the ones digit changes.
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.