You will learn
- Say that 10 tens make 100.
- Count in hundreds to 1,000.
- Read and write 100, 200 up to 1,000.
- Show a hundred with objects or a picture.
Version 0.1 · published for early use · expert review pending Standards alignment: pending verification. Not yet reviewed against the Courseversity scorecard.
Student lesson
Words to know
Ten tens. Written 100.
Ten hundreds. Written 1,000.
Groups of one hundred.
Say the next numbers in order.
1. Discover: a farmer’s sacks
A farmer packs 100 groundnuts in each bag. He has 5 bags. How many groundnuts does he have? Count the bags: 100, 200, …
2. Understand: counting hundreds
Ten tens make one hundred. We write it 100. Counting in hundreds goes: 100, 200, 300, 400, 500, 600, 700, 800, 900, 1,000.
Ten hundreds make one thousand, written 1,000. The number 300 is 3 hundreds. The number 800 is 8 hundreds.
A hundred looks like a flat square of ten rows of ten. A thousand looks like ten of those flats stacked together.
3. Explore: hundred flats
You need squared paper and a pencil.
- Draw a square of 10 rows with 10 dots in each row.
- Count the dots by tens: 10, 20, …, 100.
- Draw 3 such squares and count 100, 200, 300.
- Write each number in words and digits.
Think about it: what did you notice?
One square is 100. Three squares are 300.
4. Practise
Guided practice
Question 1. How many tens make 100?
10 tens.
Question 2. Count in hundreds: 300, 400, __
500.
Question 3. How many hundreds make 1,000?
10 hundreds.
Independent practice
- Count in hundreds from 100 to 1,000.
- What is 7 hundreds written as a number?
- What comes after 600?
- How many tens in 100?
- Write 900 in words.
Answers are in the answer key below. Try first, then check.
5. Apply: everyday mathematics
Each box holds 100 pencils. A school buys 6 boxes. How many pencils?
Show a sample answer
600 pencils.
6. Common mistake
Fix: 10 tens make 100. 10 hundreds make 1,000.
7. Check and master
Answer all questions. You will see feedback after each one.
Your result appears here after you answer every question.
8. Key takeaways
- 10 tens = 100.
- 10 hundreds = 1,000.
- Count in hundreds.
9. Next lesson
Next lesson: Numbers to 1,000. Keep going with the next idea in this course.
Printable worksheet
- Tens in 100?
- 6 hundreds as a number?
- Next: 300, 400, __
- Hundreds in 1,000?
- Write 800 in words.
Homework
Find something you can count in hundreds at home (for example 100 beans in a bowl). Show 300.
Answer key and marking scheme
| Question | Expected response | Marks |
|---|---|---|
| Tens in 100? | 10 | 2 |
| 6 hundreds as a number? | 600 | 2 |
| Next: 300, 400, __ | 500 | 2 |
| Hundreds in 1,000? | 10 | 2 |
| Write 800 in words. | eight hundred | 2 |
| Total | 10 |
Practice answers: Worksheet: 1 10; 2 600; 3 500; 4 10; 5 eight hundred.
Quiz answers: 1 A, 2 B, 3 C, 4 A, 5 B, challenge C.
Mastery and remediation
| Objective | Bronze (Developing) | Silver (Proficient) | Gold (Advanced) |
|---|---|---|---|
| O1 Say that 10 tens make 100 | Shows this with help from an adult or a picture | Does this independently and explains how they know | Explains it clearly and uses it in a new situation |
| O2 Count in hundreds to 1,000 | Shows this with help from an adult or a picture | Does this independently and explains how they know | Explains it clearly and uses it in a new situation |
| O3 Read and write 100, 200 up to 1,000 | Shows this with help from an adult or a picture | Does this independently and explains how they know | Explains it clearly and uses it in a new situation |
| O4 Show a hundred with objects or a picture | Shows this with help from an adult or a picture | Does this independently and explains how they know | Explains it clearly and uses it in a new situation |
Proposed Courseversity thresholds for this page: Bronze = at least 3 of 5 core questions correct; Silver = all 5; Gold = all 5 plus the challenge. A badge is never a full record of progress.
If a learner struggles
- Find the misconception: Saying 10 tens is 1,000. 10 tens make 100. 10 hundreds make 1,000.
- Explain another way: use real objects first, then pictures.
- Show a simpler example: Use ten bundles of ten sticks to build 100 and count by tens.
- Guided practice: work through one example together and let the learner try the next one.
- Reassess: use the quiz again or the worksheet.
- Move on when the learner shows Silver-level evidence independently.
Teacher package
1–5. Objectives, prerequisites, materials, preparation, duration
Lesson objectives. Learners will: say that 10 tens make 100; count in hundreds to 1,000; read and write 100, 200 up to 1,000; show a hundred with objects or a picture.
Prerequisite knowledge. Lesson 1: numbers to 100.
Materials. Counters (stones, seeds or bottle tops), paper, pencils, board or chalkboard. Low-resource options: use stones, seeds, sticks, bottle tops or drawings in the sand or on the board instead of printed materials.
Preparation. Gather the counters and draw the example pictures on the board before the lesson.
Suggested duration. 35–45 minutes.
6–9. Teaching procedure, explanation notes, guided and independent activities
Introduction (5 min). Start with the Discover situation and let learners suggest ideas before you teach.
Explanation (10 min). Teach the Understand section with real objects first, then pictures, then symbols and words.
Guided activity (10 min). You need squared paper and a pencil. Learners follow the Explore steps in pairs.
Independent activity (10 min). Learners complete the independent practice and the worksheet.
Assessment and reflection (5 min). Ask each learner to say one thing they learned and how they know it.
Teacher explanation notes. Use the concrete, pictorial, abstract order: real objects first, then pictures, then symbols and words. Return to real objects whenever a learner needs support.
10–12. Differentiation, formative assessment, common misconceptions
Support. Use real objects and work with a partner; say each step aloud together. Extension. Ask learners to make up their own example and explain it to a partner.
Formative assessment. Listen to learner explanations, ask “how do you know?”, and check the independent work.
Misconceptions. Saying 10 tens is 1,000. 10 tens make 100. 10 hundreds make 1,000.
13–15. Assessment questions, answer keys, marking scheme
Use the quiz and worksheet on this page. The 10-mark scheme and all answers are in the answer key above. Re-check every answer and the marking scheme before publication.
16–19. Remediation, enrichment, homework, teacher reflection
Remediation. Use ten bundles of ten sticks to build 100 and count by tens. Enrichment. Invite learners to find or create three more examples at home or in the classroom and explain them. Homework. See above.
Teacher reflection. After teaching, record: which concepts learners understood; which misconceptions occurred; which activities worked; which learners need more practice; and what to improve next time.
Sources and standards
Alignment is pending verification and no external endorsement is claimed. Reference starting points named in the Courseversity standard: Common Core State Standards for Mathematics, Cambridge Primary and the IB Primary Years Programme. Specific standard codes will be added once checked against the official documents.