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Number Sense

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โœจ

Hello Math Explorer! Get ready for an exciting adventure.

Each topic has fun activities and games to help you learn. Complete all sections to learn well!

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Math Adventure Complete! ๐ŸŽ‰

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Even & Odd Numbers Adventure ๐ŸŽฒ

Every whole number is either even or odd. Letโ€™s see what that means!

Even Numbers

๐Ÿ‘ You can split them into two equal groupsโ€”no one is left out!

  • Imagine 4 cookies: you and a friend each get 2.
  • Examples: 2, 4, 6, 8, 10, 12, ...

Odd Numbers

๐Ÿคท Youโ€™ll always have one extraโ€”someone misses out a little!

  • Imagine 5 apples: when you share, one apple is left alone.
  • Examples: 1, 3, 5, 7, 9, 11, ...

Odd & Even Equations Challenge

Click a number from the options below to place it in the blue box to make it ODD or EVEN!

?
= ?

Click the correct number from the options below to complete the equation!

Odd or Even Sums

Solve each addition question and decide whether the answer is odd or even.

Step 1: Click the correct number (which are in the options below) to place it in the box

Step 2: Select Even or Odd for your answer

Complete the Number Sequence

Type the missing numbers to complete the sequences!

Divide the balls equally between the two containers.

How to play: Click on the LEFT or RIGHT container to move one ball at a time

Total Balls: 0

Click to Add Ball
Count: 0
Drag Balls From Here
Click to Add Ball
Count: 0

Number Detective Challenge ๐Ÿ”

Find all the even numbers below!

Place Value Explorer ๐Ÿ”ข

Each digit sits in its own place ๐Ÿช‘ โ€” and that place gives it its power ๐Ÿ’ช!

๐Ÿ‘‘ Thousands | ๐Ÿ’ฏ Hundreds | ๐Ÿ”Ÿ Tens | 1๏ธโƒฃ Ones

Letโ€™s explore the number ๐Ÿ‘‰ 4,237

4 ๐Ÿ‘‘ = 4 ร— 1000 = 4000
2 ๐Ÿ’ฏ = 2 ร— 100 = 200
3 ๐Ÿ”Ÿ = 3 ร— 10 = 30
7 1๏ธโƒฃ = 7 ร— 1 = 7

โœจ Add them all: 4000 + 200 + 30 + 7 = 4,237

Indian Number System

International Number System

What is the place of the highlighted digit in the Indian system?

Tens & Ones Game

Count the rods and cubes, then enter your answer

Tens (Rods)
Ones (Cubes)
Number Value:
โ€”
Correct Answers
0
Problems Solved
0

Each rod represents 10, and each cube represents 1. Count them and enter the values!

Place Value Practice ๐Ÿ”ข

3,728

What is the value of the hundreds place?

Expanded Form Step by Step ๐Ÿ“

Letโ€™s understand what each digit in a number really means!

Expanded form helps us see the value of each digit based on its place.

For example: 5,149

๐Ÿ‘‰ First, break it by place value:
5,000 + 100 + 40 + 9

๐Ÿ‘‰ Now, write it using multiplication:
(5 ร— 1,000) + (1 ร— 100) + (4 ร— 10) + (9 ร— 1)

Represent the number 32, using the correct number of Tens Rods and Ones Cubes

Target: 32

Tens

Ones

Build the Number with Place Value Blocks

Drag blocks to build the number: 3,728

Thousands
Hundreds
Tens
Units
Your Value: 0

Convert Between Standard and Expanded Forms

Standard Form

0

Expanded Form

Computed Value: 0

Expanded Form Practice ๐Ÿ“

5,149
? + ? + ? + ?

We'll start with the thousands place. What is the thousands part? (ร—1000)

Abacus Explorer ๐Ÿงฎ

๐Ÿค” What is an abacus?
It's a counting tool with rods of beads. Each rod represents a place value.

๐Ÿ“ In Level 1:
- Each bead represents 1 of that column's value
- Move beads up to add to the total

โœจ To show the number 7:
1. Pick the "Units" column
2. Slide 7 beads up
3. You'll see "7"!

๐Ÿ” Detective Mission

Look at the beads shown on each rod and count them! Click beads to mark them as counted. Each color represents a different place value!

๐Ÿงฎ Interactive Abacus
Hundreds (100)
Tens (10)
Ones (1)

๐ŸŽฏ What's the total number?

Abacus Level 1 Practice ๐Ÿงฎ

Click on the (+) or (-) icons under each column (Th, H, T, U) to adjust the bead count and achieve the Target Value
Your Value: 0
Target: 1,234

Advanced Abacus Explorer ๐Ÿงฎโœจ

๐ŸŒŸ Welcome to Level 2!
Now we'll work with larger numbers and different bead values.

๐Ÿ“ Each column has two bead types:
- Top beads (red): Each represents 5 when moved down
- Bottom beads (green): Each represents 1 when moved up

โœจ To show the number 7:
1. Move one top bead down (5)
2. Move two bottom beads up (2)
3. Total = 5 + 2 = 7

Advanced Abacus Practice ๐Ÿงฎโœจ

Fill the abacus by clicking the empty circles until Your Value matches the Target
Click on empty circles to fill the abacus
Your Value: 0
Target: 12,345

Numerals & Number Names ๐Ÿ”ค

Numbers have two forms: Numerals (digits) and Number Names (words)

Numerals

Symbols we use to write numbers

1, 2, 3, 4, 5
10, 25, 100

Number Names

Words we say when reading numbers

one, two, three
ten, twenty-five
Numeral Number Name
1 one
5 five
10 ten
15 fifteen
20 twenty
Single-digit numbers: 0/2

Convert this to number name:

5

Time to Learn! ๐Ÿ“š

Roman Numerals Lesson

Do you know that long ago, people in Rome didnโ€™t use numbers like 1, 2, 3? ๐Ÿค”

They used special LETTERS to show numbers. These are called Roman Numerals.

Here are some of them:

  • I = 1
  • V = 5
  • X = 10
  • L = 50
  • C = 100

To make bigger numbers, they added these letters together.

Letโ€™s take an example ๐Ÿ‘‡

86 can be written as 80 + 6.

80 = LXXX โ†’ (L = 50 and XXX = 10 + 10 + 10)

6 = VI โ†’ (V = 5 and I = 1)

So, 86 = LXXX + VI = LXXXVI

Roman Numerals Challenge ๐Ÿ†

Match the Arabic numbers to their Roman numeral equivalents!

Drag the Roman numeral tiles into the empty boxes below to correctly represent the number

0

Roman Numerals Practice ๐Ÿ›๏ธ

86
86 = 80 + 6
? + ? = ?

We build Roman numerals by combining tens and ones. First, convert the tens part.