126 Views

Download Presentation
## Regrouping: Also known as FUNNY NUMBERS!

- - - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - - -

**Regrouping: Also known as FUNNY NUMBERS!**How would you write 5 ones? 5 x 1 = 5 9 x 1 = 9 How would you write 9 ones? 11 x 1 = 11 How would you write 11 ones? How would you write 25 ones? 25 x 1 = 25 Anything times “1” is the same number. So 1,000,000 x 1 is still 1,000,000!**So the number of ones you have is how much you have!**What about tens? How would you write 5 tens? 5 x 10 = 50 How would you write 9 tens? 9 x 10 = 90 How would you write 11 tens? 11 x 10 = 110 How would you write 25 tens? 25 x 10 = 250 What is happening? For tens, you add “1” zero.**So, for tens, you add “1” zero.**What happens with hundreds? 2 x 100 = 200 How would you write 2 hundreds? How would you write 9 hundreds? 9 x 100 = 900 How would you write 13 hundreds? 13 x 100 = 1300 19 x 100 = 1900 How would you write 19 hundreds? For hundreds, you add “2” zeros. What is happening?**So, for tens, you add “1” zero.**And for hundreds, you add “2” zeros. What about thousands? 4 x 1000 = 4000 How would you write 4 thousands? How would you write 7 thousands? 7 x 1000 = 7000 How would you write 11 thousands? 11 x 1000 = 11000 19 x 1000 = 19000 How would you write 19 thousands? For thousands, you add “3” zeros. What is happening?**Let’s review…**For ones, So, for tens, you add And for hundreds, you add For thousands, you add the number of ones is the number. “1” zero. “2” zeros. “3” zeros.**Let’s try a problem together.**What means the same thing as 5 tens and 11 ones? Hmm… 5 tens means 50and 11 ones means 11. So, I just add 50 + 11. And that equals 61. My conclusion is that 5 tens and 11 ones means the same thing as 61.**Let’s try another.**What means the same thing as 12 tens and 17 ones? 120 17 Hmm… 12 tens means _____ and 17 ones means _____. 120 17 137 So, I just add ____ + _____. And that equals _____.**What about this?**What means the same thing as 15 hundreds, 18 tens, 12 ones? 1500 180 Hmm… 15 hundreds means _____ and 18 tens means _____ And 12 ones means ______. 12 1500 180 12 So, I just add ____ + _____ + _____. And that equals _____. 1692**What about this?**What means the same thing as 6 thousands, 15 hundreds, 18 tens, 12 ones? 6000 Let’s see… 6 thousands means _________ 15 hundreds means ______ 18 tens means ______ 12 ones means ______. 1500 180 12 6000 1500 180 12 So, I just add______ + ______ + ______ + ______ . And that equals _______. 7692**Try this!**What means the same thing as 8 thousands, 16 hundreds, 16 tens, 16 ones? 8000 Let’s see… 8 thousands means _________ 16 hundreds means ______ 16 tens means ______ 16 ones means ______. 1600 160 16 8000 1600 160 16 So, I just add______ + ______ + ______ + ______ . And that equals _______. 9776**Now let’s switch gears!**What means the same as 6,429? I have to work through ALL of the following problems! A. B. 5000 6 thousands means _________ 14 hundreds means ______ 12 tens means ______ 9 ones means ______. 6000 5 thousands means _________ 14 hundreds means ______ 12 tens means ______ 19 ones means ______. 1400 1400 120 120 9 19 That adds up to 7,529. Nope! That adds up to 6,539. Nope! D. C. 6 thousands means _________ 14 hundreds means ______ 12 tens means ______ 19 ones means ______. 6000 5 thousands means _________ 13 hundreds means ______ 11 tens means ______ 19 ones means ______. 5000 1400 1300 120 110 19 19 That adds up to 7,539. Nope! That adds up to 6,429. Bingo!!**Here we go again!**What means the same as 9,584? I have to work through ALL of the following problems! A. B. 8000 9 thousands means _________ 14 hundreds means ______ 15 tens means ______ 14 ones means ______. 9000 8 thousands means _________ 15 hundreds means ______ 18 tens means ______ 19 ones means ______. 1400 1500 150 180 14 19 That adds up to 10,564. No way! That adds up to 9,684. Close, but no! D. C. 8 thousands means _________ 14 hundreds means ______ 17 tens means ______ 14 ones means ______. 8000 9 thousands means _________ 13 hundreds means ______ 17 tens means ______ 14 ones means ______. 9000 1400 1300 170 170 14 14 That adds up to 9,584. Yippee! That adds up to 10,484. Nope!!**Do this problem on a piece of paper.**Problem 1 Which means the same as 8,765? • 8 thousands + 7 hundreds + 16 tens + 15 ones • 8 thousands + 17 hundreds + 6 tens + 5 ones • 8 thousands + 6 hundreds + 15 tens + 15 ones • 7 thousands + 17 hundreds + 15 tens + 16 ones 8000 + 700 + 160 + 15 = 8,865 8000 + 1700 + 60 + 5 = 9,765 8000 + 600 + 150 + 15 = 8,765 7000 + 1700 + 150 + 16 = 8,866**Do this problem on a piece of paper.**Problem 2 Which means the same as 4,321? • 4 thousands + 3 hundreds + 12 tens + 11 ones • 3 thousands + 3 hundreds + 12 tens + 1 one • 3 thousands + 13 hundreds + 11 tens + 11 ones • 3 thousands + 12 hundreds + 11 tens + 11 ones 4000 + 300 + 120 + 11 = 4,431 3000 + 300 + 120 + 1 = 3,421 3000 + 1300 + 110 + 11 = 4,421 3000 + 1200 + 110 + 11 = 4,321**Do this problem on a piece of paper.**Problem 3 Which means the same as 2,468? • 2 thousands + 4 hundreds + 6 tens + 18 ones • 1 thousand + 13 hundreds + 15 tens + 18 ones • 1 thousand + 14 hundreds + 15 tens + 18 ones • 2 thousands + 13 hundreds + 15 tens + 18 ones 2000 + 400 + 60 + 18 = 2,478 1000 + 1300 + 150 + 18 = 2,468 1000 + 1400 + 150 + 18 = 2,568 2000 + 1300 + 150 + 18 = 3,468**When you see a problem like this,**REMEMBER to work out each problem to find one that matches the given number! Perseverance is the KEY!