Study Guide — K.CC.B.4
Numbers and quantities (cardinality)
Cardinality means the last number counted tells how many. One-to-one matching matters.
What this standard means
- Pair one number name with one object (one-to-one)
- Know the last number tells how many (cardinality)
- Understand each next number is one more
- Count in order regardless of arrangement
_See printable PDF for diagram._
How to use the 20 practice sets
| Sets | When to use | | --- | --- | | 1–5 | Intro — explore together, short written items | | 6–10 | Core skills — diagrams and written practice | | 11–15 | Mixed review — explain thinking | | 16–20 | Stretch — word problems and mastery tasks |
Pacing: 10–15 minutes per session.
How to practice
1. Touch and count slowly 2. Ask “How many?” after counting — don’t recount 3. Scatter objects, line them up, recount — same total?
_See printable PDF for diagram._
Common mistakes
- Counting faster than pointing
- Saying the next number without counting all objects
- Thinking rearranging objects changes the total
Review and practice tests
1. Start Review 1/10 when sets 1–3 feel comfortable. 2. Move up one review level with little help. 3. Use Practice Test 4/10–6/10 for mid-standard checks. 4. Practice Test 10/10 is the mastery bar for K.CC.B.4.
- [ ] One-to-one correspondence to 20
- [ ] States total without recounting
- [ ] Explains “one more” on the number line
Materials for this standard
- Practice Problems — 20 printable sets
- Review — 10 difficulty levels
- Practice Test — 10 difficulty levels
- Answer key — for parents and tutors