Numbers to 100 · 마틴과 코딩하기

Twenty, thirty… up to a hundred. You will learn to read, write and order numbers to a hundred.

Up to a hundred

You already know tens and ones. Now every number to a hundred belongs to you.

First the full tens: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100. Ten steps of ten. Learn to say them like a rhyme.

All the other numbers live between them. 47 lives between 40 and 50. 82 lives between 80 and 90.

A hundred is the first number with three digits: 100. It is ten full crates of ten bottles. A big number? Not really. If you know the tens, a hundred is just the tenth step.

You meet a hundred more often than you think. A 100 Kč note in a purse. A hundred points in a game. A metre has a hundred centimetres. Anyone who knows numbers to a hundred can talk in a shop, in a game and on the playground. It is a big step — and you already have everything you need for it.

Today you will learn to read every number to a hundred, write it and find its place in the row.

Sofie plays Ludo with grandad, but they count the steps on a hundred chart — ten rows of ten. Sofie stands on 37. She rolled a six… “37, 38, 39, 40, 41, 42, 43!” Grandad points: “Look, you jumped onto the next row. Each row is one ten.” Sofie looks at the chart: under 37 is 47, under that 57. “One row down is always ten more!” Grandad nods: “Anyone who understands the chart understands a hundred.” Then Sofie jumps down the rows on purpose: 7, 17, 27, 37. The tens grow, the ones stay put. Grandad nods happily.

💡

Say the tens like a rhyme: ten, twenty, thirty… a hundred. Once you know them, every number to a hundred finds its place by itself.

Reading, writing and ordering to 100

Reading a number. You see 63. Front digit: 6 tens = sixty. Back: 3 ones. You read: sixty-three.

Writing a number. You hear “eighty-five”. Eighty = 8 tens, write 8. Five ones, write 5. Written: 85.

Counting in tens. From any number you can jump in tens: 23, 33, 43, 53… The ones do not change, only the ten grows. This is the fastest path through a hundred.

Ordering. Which number is bigger? You know the rule: tens first, then ones. 76 and 67? Seven tens against six — 76 wins.

Neighbours. Before 50 is 49, after 50 is 51. Watch the tens breaks: after 39 comes 40, after 69 comes 70. That is where people slip the most.

Draw a number line in tens: 0, 10, 20… 100. You can roughly place every number: 47 is between 40 and 50, closer to 50. A line to a hundred is the same friend as a line to twenty, just longer.

Write the number seventy-two

I hear seventy — that is 7 tens. I write 7.

I hear two — 2 ones. I write 2.

Written: 72.

Check by reading: 7 tens is seventy, 2 on top. Seventy-two. It matches.

Watch the trap: seventy-two is not 702. Tens and ones live in two digits next to each other.

What comes after 59?

I count: 57, 58, 59… and now?

Nine is the last one. The row is full. I jump to the next ten.

After 59 comes 60.

And on: 61, 62, 63… A tens break is like the end of a line in a book — you carry on at the next line on the left. Try other breaks too: after 29 is 30, after 89 is 90, after 99 is 100.

Order the numbers 45, 54 and 44

I compare tens: 45 has 4, 54 has 5, 44 has 4.

The most tens has 54 — it is the biggest.

Left are 45 and 44. Tens the same (4 and 4), ones decide: 5 > 4. So 45 > 44.

From smallest: 44, 45, 54.

I write it with the crocodile too: 44 < 45 < 54.

⚠️

The biggest trap is the tens breaks. After 39 it is not “thirty-ten”, but 40. If you are not sure, say the tens rhyme: thirty… forty.

Practice: now you do it 🎲

Now try it for real. You will see all the questions at once, like on paper. 시작 with ten. If it goes well, add more.

Take the number apart into tens and ones.

Practise the questions

On paper

Paper and a pencil. If you want, draw a hundred chart.

Write the tens rhyme: 10, 20, 30… up to 100.
Write as a parent says them: forty-six, ninety, sixty-eight, a hundred.
Fill in the neighbours: ? 50 ?, ? 80 ?, ? 99 ?.
Order from smallest: 73, 37, 70, 33.

Now you 💪

I can say the full tens from 10 to 100.
I can write every number to a hundred that someone says.
I know what comes after 39, 59 and 99.

✅

Done when: You write five numbers to a hundred that someone says, with no mistake, and you order them from smallest.

What to take from this lesson

Full tens are steps: 10, 20… 100.
Every number to a hundred = tens and ones.
After the ninth one you jump to a new ten: after 59 is 60.
Compare tens first, then ones.
A hundred = ten tens. It is written with three digits: 100.