Add two multiples of ten
Key notes :
🔟➕🔟 Multiples of Ten
- Numbers like 10, 20, 30, 40, 50, 60… are called multiples of ten.
- They always end with a 0. 🟠
➕ Adding Multiples of Ten Is Easy!
When we add numbers like 20 + 30, we only add the tens.
The zero stays zero! 😄
Example:
- 20 + 30 = 50
- 40 + 10 = 50
🎯 Add the Tens Digits
Look at the first digit (tens place).
Example:
- 30 (3 tens)
- 40 (4 tens)
Add the tens: 3 + 4 = 7
So, 30 + 40 = 70 🎉
🧮 Use Counting by Tens
- Children can count: 10, 20, 30, 40…
- Example: Start at 20 → count 3 steps by 10 → 50! 💚
🌟 Use Number Line
Jump in tens:
Example:
- Start at 10
- Jump +10
- Jump +10
- Land on 30 ✔️
💡 Real-Life Examples
- 10 pencils + 20 pencils = 30 pencils ✏️
- 20 balloons + 30 balloons = 50 balloons 🎈
🥳 Big Idea
👉 Adding two multiples of ten is just adding the tens!
👉 It is simple, quick, and fun! 😍
Learn with an example
📜Add:10 + 50 =
Notice that both numbers have 1 zero at the end. When the number of zeros is the same, it is easy to add. First, arrange the numbers one above the other:
10+50
Next, add the zeros. Wherever there is a zero below another zero, place a zero at the bottom. This is because zero plus zero equals zero.
10+50=0
Now add the remaining digits. One plus five is six.
10+50=60
📜Add:10 + 60 =
Notice that both numbers have 1 zero at the end. When the number of zeros is the same, it is easy to add. First, arrange the numbers one above the other:
10+60
Next, add the zeros. Wherever there is a zero below another zero, place a zero at the bottom. This is because zero plus zero equals zero.
10+60=0
Now add the remaining digits. One plus six is seven.
10+60=70
📜Add:80 + 10 =
Notice that both numbers have 1 zero at the end. When the number of zeros is the same, it is easy to add. First, arrange the numbers one above the other:
80+10
Next, add the zeros. Wherever there is a zero below another zero, place a zero at the bottom. This is because zero plus zero equals zero.
80+10=0
Now add the remaining digits. Eight plus one is nine.
80+10=90
Let’s practice!
