Grade 1 (age 6-7)

Addition Basics

Addition is how we gather things together and count how many there are in all. When a plate has 3 apples and you add 2 more, you count on, four, five, reaching 5 without starting over. We write it with the plus sign: 3 + 2 = 5. Here you slide the fruit and move along the number line to see that order never changes the answer.

What is Combining?

🤲 Combining = Putting Together

①2 apples in left hand, 3 apples in right

②Put hands together? → 5 apples!

③This is "addition"

④The symbol for combining is +

Let's Combine Fruits

Apple Apples3

Banana Bananas2

💡 Understanding Addition

①Combine apples and bananas

②Counting in order gives the total

③3 + 2 = 5 → "3 plus 2 is 5"

④Try changing the slider!

Adding on a Number Line

Starting Number4

Add3

➡️ Adding on a Number Line

①The red dot is the starting number

②The dashed arc moves by the amount added

③The green dot is the answer!

④Adding moves right on the number line

Summary

Addition Symbol

Apple + Banana = Total

Plus (+) means combining two numbers

Adding 0

Any number + 0 = same number

Adding 0 keeps the same value (nothing added)

Switching Order

3 + 2 = 2 + 3 = 5

Order does not change the answer!

🎯 Remember!

①Addition is "combining"

②+ means "plus"

③Move right on a number line

④Adding 0 keeps it the same

⑤Order does not change the result!

Examples and Unit Test

Example 1

A plate has 3 apples. If you add 2 more apples, how many apples are there in all?

There are 3 apples to start.

Count on 2 from 3: 4, 5. So 3 + 2 = 5.

▸ 5 apples

Adding means gathering two numbers and counting them together.

Example 2

Minsu has 6 candies and Jiu has 3 candies. How many candies do they have altogether?

Add the two numbers: 6 + 3.

Count on 3 from 6: 7, 8, 9.

▸ 9 candies

6 + 3 equals 3 + 6. Changing the order does not change the sum.

Unit Test

What is the value of 7 + 2?

①8

②9

③10

④5

▸ ② 9

Count on 2 from 7: 8, 9.

So 7 + 2 = 9. The answer is 9.

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Numbers up to 100

Subtraction Basics