Grade 2 · Maths · Lessons
Ten tens make a hundred
🟦flat: 100📏rod: 10🧊cube: 1💯hundred
Ten tens make a hundred.The big ideaTen tens make a hundred. Each digit says how many of its place.
How it works
A flat is one hundred. A rod is ten. A cube is one.
Ten rods make a flat. Ten ones make a rod.
In a number, each digit says how many of its place: 6 hundreds, 0 tens and 8 ones is 608.
Example 1: Rods only
- 20 rods: ? ? ?
- Ten rods make a flat, so group them in tens.
- Say how many hundreds, tens and ones are left.
- So the answer is 2, 0, 0.
Example 2: Flats and cubes
- 6 flats, 8 cubes: ? ? ?
- Count the flats for the hundreds.
- A place with nothing is a zero, and it still needs to be written.
- So the answer is hundreds = 6, tens = 0, ones = 8.
Example 3: More than ten rods
- 1 flat, 12 rods, 1 cube: ? ? ?
- Ten rods turn into a flat. Trade them.
- Then count the new hundreds, tens and ones.
- So the answer is hundreds = 2, tens = 2, ones = 1.
Words to know
- hundreds
- Groups of one hundred.
- place value
- What a digit is worth because of where it sits.
Watch out
- Don't skip a zero. 608 is not 68.
- With more than 9 rods, trade ten of them for a flat.
- Each digit is worth its place.
Try it
- How many tens make a hundred?
- In 346, how many hundreds, tens and ones?
- How many tens are in 70?
- What number is 5 hundreds, 0 tens and 2 ones?
Answers: 1. 10 · 2. 3 hundreds, 4 tens, 6 ones · 3. 7 · 4. 502
For grown-upsUse 10 beans or pasta in cups to build tens and then a hundred, and have your child trade ten for one.