Embed Size (px)
Citation preview
Subtracting With Place Value
Place Value to Subtract
1
10
100
1,000 How many ones make a
ten?
Place Value to Subtract
1
10
100
1,000
How many tens make a hundred?
Place Value to Subtract
1
10
100
1,000How many hundreds make a thousand?
Place Value to Subtract
Are the two amounts above
worth the same?If I started with the picture on the left, how
could I make the picture on the right?
Place Value to Subtract
Are the two amounts above
worth the same?If I started with the picture on the left, how
could I make the picture on the right?
Place Value to Subtract
Are the two amounts above
worth the same?
If I started with the picture on the left,
how could I make the picture on the right?
Place Value to Subtract
If I started with the picture on the left,
how could I make the picture on the right?
389- 122
762
1 2 2
267
389- 122
443- 235
2 5 3
4 3 13
443- 235
2 5 3
8 0 2
208
443- 235
You try!
764 - 592 You do the work on your whiteboard. Then, we will look over it together on my big whiteboard.
Remember to draw the first number 1st!
You try!
764 – 592 = 172
Subtracting with the Standard Algorithm
627 - 235
627- 235
627 - 235
627- 235 2
Can I take 3 away from 2? Why not?
What did we do with our place value blocks when this happened ?
627 - 235
627- 235 2
512 So, then let’s
unbundle one of the 6 hundreds!
What will that leave us with?
627 - 235
627- 235 92
512 So, then let’s
unbundle one of the 6 hundreds!
What will that leave us with?
627 - 235
627- 235 392
512 So, then let’s
unbundle one of the 6 hundreds!
What will that leave us with?
392
627- 235
Let’s try some together on the
smartboard using your
whiteboards!
Now let’s check your answers!
904- 385
314- 247
804- 469
200- 176
4,108- 2,604
5,204- 2,985
Put up your pencil and get out your red pen!
Now let’s check your answers!
904- 385 519
314- 247 67
804- 469 335
200- 176 24
4,108- 2,604 1,504
5,204- 2,985 2,219
If you missed 0 – 1:
1. Do the workbook page.
2. Keep it at your desk when you are done.
3. Play a math game.
If you missed 2 – 3:
1. Find your mistakes and fix them.
2. If you know where you went wrong,
do the workbook page. If you can’t find me.
3. Keep it at your desk. If time, play a math game.
If you missed 4 – 6:
Bring your workbook page and pencil to the back table.
