🔢 Numbers up to 999

What your child will learn

• Students will be able to show a three-digit number as hundreds, tens and ones using objects, pictures or an abacus.
• Students will be able to read and write three-digit numerals and number names, including numbers with zero in the tens or ones place.
• Students will be able to write a three-digit number in expanded form and state the place value of any digit.
• Students will be able to compare two three-digit numbers using place value and the symbols >, < and =.
• Students will be able to arrange up to five three-digit numbers in ascending or descending order.
• Students will be able to count forward and backward from any number below 1000 in steps of 1, 10 and 100, and continue such number patterns.
• Students will be able to round a three-digit number to the nearest ten and use it to estimate.

Lessons in this unit

1. Making a hundred: Ten tens make one hundred. Children bundle ten ten-rods into one hundred-block, count 10, 20 ... 100, and see 100 written.
2. Hundreds, tens and ones: Build and name three-digit numbers from hundred-blocks, ten-rods and unit cubes, and record them in a place value chart (H T O).
3. Expanded form and place value: Split a three-digit number into hundreds + tens + ones (482 = 400 + 80 + 2) and tell the value of each digit.
4. Comparing numbers: Compare two three-digit numbers by looking at hundreds first, then tens, then ones, and write >, < or =.
5. Ordering numbers: Arrange three to five numbers in ascending or descending order by comparing hundreds, tens and ones, and read simple number lines.
6. Counting in 1s, 10s and 100s: Count forward and backward from any number in steps of 1, 10 and 100, including crossing a hundred (e.g. 590, 600, 610), and continue number patterns.
7. Rounding to the nearest ten: Use a number line to find the nearest ten for a number up to 999 and use 'about' language to estimate.

Key words

hundred

10 tens put together. We write it as 100.

place value

What a digit is worth because of where it sits: hundreds, tens or ones.

digit

One of the symbols 0 to 9 that we use to write numbers.

expanded form

A number split into its parts, like 345 = 300 + 40 + 5.

greater than / less than

Bigger than (>) or smaller than (<).

ascending order

From smallest to biggest, like climbing stairs.

descending order

From biggest to smallest, like coming down stairs.

round off

Say the nearest easy number, like calling 48 'about 50'.

Help your child at home

What to watch for

100 is 'ten and zero and zero', three separate things rather than one hundred.

Help: Bundle ten tens and count the bundle as 'one hundred'. Say '1 hundred, 0 tens, 0 ones'.

Zero in the middle can be dropped: 306 is written as 36.

Help: Use the H T O chart; every column needs a digit. 0 tens still needs a 0.

The place value of a digit is the digit itself: in 482 the 8 is worth 8.

Help: Point to the 8 ten-rods. Count them: 10, 20 ... 80. The 8 stands for 80.

The number with the bigger ones digit is bigger: 129 > 231 because 9 > 1.

Help: Always start at the hundreds. 1 hundred is less than 2 hundreds, so 129 < 231.

Try this at home

• Bundle 10 ten-rods into a hundred-block and record 100
• Blocks to number: 2 hundred-blocks, 4 ten-rods, 7 cubes → 247
• Number → expanded form: put 482 in the place value chart, read each column's value 400, 80, 2
• Different hundreds: 398 vs 412

Quick questions to ask aloud

1. How many tens make one hundred? (10 / 100 / 1)
   Show answer

   Count the ten-rods: 10, 20, 30 ... 100. Ten tens make one hundred.
2. Arjun has 3 hundred-blocks, 5 ten-rods and 2 cubes. What number has he made?
   Show answer

   3 hundreds, 5 tens and 2 ones. In the H T O chart that is 3 5 2, so the number is 352.
3. Which is the expanded form of 482? (400 + 80 + 2 / 4 + 8 + 2 / 400 + 8 + 2 / 480 + 20)
   Show answer

   482 has 4 hundreds (400), 8 tens (80) and 2 ones (2). So 482 = 400 + 80 + 2.

Parent guide: how to help your child with Class 3 Maths

Frequently asked questions

What will my child learn in "Numbers up to 999" (Class 3 Maths)?

Your child will be able to: show a three-digit number as hundreds, tens and ones using objects, pictures or an abacus.; read and write three-digit numerals and number names, including numbers with zero in the tens or ones place.; write a three-digit number in expanded form and state the place value of any digit.; compare two three-digit numbers using place value and the symbols >, < and =.; arrange up to five three-digit numbers in ascending or descending order.; count forward and backward from any number below 1000 in steps of 1, 10 and 100, and continue such number patterns.; round a three-digit number to the nearest ten and use it to estimate..

How does MangoMindz teach "Numbers up to 999"?

In 7 short parts (Making a hundred, Hundreds, tens and ones, Expanded form and place value, Comparing numbers, Ordering numbers, Counting in 1s, 10s and 100s, Rounding to the nearest ten). Each part has a picture-based lesson read aloud by Mango Teacher, a quick check, and a quiz built from common mistakes children make, with Mango, a study buddy, for questions.

How long does "Numbers up to 999" take?

About 160 minutes in total, spread over 7 parts of 15–25 minutes each.

How can I help my child with "Numbers up to 999" at home?

Work through a small example together, such as: Bundle 10 ten-rods into a hundred-block and record 100; Blocks to number: 2 hundred-blocks, 4 ten-rods, 7 cubes → 247. Then ask a quick question aloud: How many tens make one hundred? (10 / 100 / 1)

What mistakes do children often make in "Numbers up to 999"?

100 is 'ten and zero and zero', three separate things rather than one hundred. Fix: Bundle ten tens and count the bundle as 'one hundred'. Say '1 hundred, 0 tens, 0 ones'. Zero in the middle can be dropped: 306 is written as 36. Fix: Use the H T O chart; every column needs a digit. 0 tens still needs a 0. The place value of a digit is the digit itself: in 482 the 8 is worth 8. Fix: Point to the 8 ten-rods. Count them: 10, 20 ... 80. The 8 stands for 80.

Is "Numbers up to 999" free on MangoMindz?

Yes. Every lesson part and quiz in "Numbers up to 999" is free on MangoMindz, with no ads.