Addition within 100: Tens and Ones (No Regrouping)

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Super Power Adding: Let's Team Up Tens and Ones!

Hi, Math Explorer! Have you ever built something amazing with LEGO blocks? Imagine the long blocks are your "Tens" and the small, single blocks are your "Ones." Adding big numbers is just like putting your LEGOs together to build something even bigger and cooler! When we add numbers like 23 + 45, we don't have to count all the way from 1. We have a super strategy: we team up the Tens first, and then we team up the Ones!

Let's try it! Imagine you have 3 long blocks (30) and your friend has 4 long blocks (40). If you put them together, how many long blocks do you have? You just add 3 + 4 = 7. That's 7 long blocks, which is 70! See? You're already a pro at adding Tens!

Let's Build an Answer!

Let's solve 23 + 45.

Break it down: The number 23 is 2 Tens and 3 Ones. The number 45 is 4 Tens and 5 Ones. You can even draw this! Draw 2 sticks and 3 circles for 23, and 4 sticks and 5 circles for 45.
Add the Tens (the long blocks): Let's group the Tens together. 2 Tens + 4 Tens = 6 Tens. That's 60!
Add the Ones (the small blocks): Now, let's group the Ones. 3 Ones + 5 Ones = 8 Ones. That's 8!
Put it all together: We have 60 from our Tens and 8 from our Ones. So, 60 + 8 = 68. You did it!

Key Takeaway!

To add big numbers, just remember this simple trick: Add the tens, then add the ones. It's like sorting your toys before you play!

Story Time Adventure!

Let's use our math powers to solve a problem!

Leo collected 12 shiny stickers for his collection. His grandma gave him 25 more stickers for his birthday! How many stickers does Leo have in total?

Let's solve it!
The tens are 10 (from 12) and 20 (from 25). So, 10 + 20 = 30.
The ones are 2 (from 12) and 5 (from 25). So, 2 + 5 = 7.
Now, put them together: 30 + 7 = 37.

Leo has 37 amazing stickers! Great job using your super adding skills to help him!

Sample questions

1. You have 2 bundles of 10 pencils. Your friend gives you 3 more bundles of 10 pencils. How many pencils do you have in all?

✓ 50

○ 5

○ 23

○ 60

Answer: 50 — Think about how many bundles of 10 pencils you have in total.

2. What is 4 tens + 2 tens?

○ 6

✓ 60

○ 42

○ 70

Answer: 60 — How many tens are there when you put 4 tens and 2 tens together? What number is that?

3. Look at the tens blocks. If you have 1 tens block and then add 6 more tens blocks, how many blocks do you have altogether?

○ 7

○ 16

✓ 70

○ 60

Answer: 70 — Count how many tens blocks you have altogether.

Skills in this topic

Add multiples of 10 within 100 (e.g., 30 + 40) using concrete objects and number bonds.
Add a two-digit number and a one-digit number within 100 without regrouping (e.g., 23 + 5).
Add two two-digit numbers within 100 without regrouping (e.g., 23 + 45) using place value strategies.
Solve addition equations within 100 (no regrouping) using mental math or pictorial models.
Create a scenario where adding two-digit numbers without regrouping is useful, and solve it.

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