๐งฎ Adding Two-Digit Numbers Without Regrouping
Hello, friend! Today we'll learn to add big numbers easily and simply! ๐๐๐
๐ฆ 1. What is "place value"?
Every two-digit number consists of tens and ones!
๐ Imagine that a number lives in a house with two rooms:
- Left room โ for tens (big blocks of 10)
- Right room โ for ones (small blocks of 1)
23
2 tens (20)
3 ones (3)
23 = 20 + 3
56
5 tens (50)
6 ones (6)
56 = 50 + 6
71
7 tens (70)
1 one (1)
71 = 70 + 1
๐ค 2. What does "without regrouping" mean?
โ It's very simple!
"Without regrouping" means that when we add:
- Ones + ones = less than 10
- Tens + tens = less than 10
โ WITHOUT regrouping
23 + 14
Ones: 3 + 4 = 7 (less than 10 โ)
Tens: 2 + 1 = 3 (less than 10 โ)
โ WITH regrouping (this is harder!)
28 + 15
Ones: 8 + 5 = 13 (more than 10 โ)
We'll learn this later!