subtraction across zeroes
DESCRIPTION
39. 13. 19. 10. 403 - 25. 200 - 99. Subtraction Across Zeroes. By Jamie Unverzagt. Hundreds Tens Ones. Let’s model 102 minus 38 . Begin by showing 102. 102. - 38. Hundreds Tens Ones. If you have 2 ones , can you take away 8 ones ?. 10 2. - PowerPoint PPT PresentationTRANSCRIPT
Subtraction Across Zeroes
By Jamie Unverzagt
403 - 25
200- 99
39 1913 10
Hundreds Tens Ones
102- 38
Let’s model 102 minus 38. Begin by showing 102.
Hundreds Tens Ones
102- 38
If you have 2 ones, can you take away 8 ones?
Hundreds Tens Ones
102- 38
How can you get more ones? There are no tens to trade!
Hundreds Tens Ones
102- 38
How many tens are in a hundred?
Hundreds Tens Ones
102- 38
1 Hundred is the same as 10 tens!
Good thinking!
Hundreds Tens Ones
102- 38
Now can you get more ones?
Hundreds Tens Ones
102- 38
How many tens and ones now?
9 12
Hundreds Tens Ones
102- 38
What’s the next step?
9 12
4How many ones are left?
Hundreds Tens Ones
102- 38
What’s the next step?
9 12
4How many tens are left?6
Hundreds Tens Ones
203- 57
Let’s model 203 minus 57. Begin by showing 203.
Hundreds Tens Ones
203- 57
If you have 3 ones, can you take 7 ones away?
Hundreds Tens Ones
203- 57
If 10 tens are in one hundred, how many tens are in two hundreds?
10 tens + 10 tens =
20 tens
Hundreds Tens Ones
203- 57
Can you trade one of the 20 tens for ones? How many tens are left?
20 tens- 1 ten =
19 tens
Hundreds Tens Ones
203- 57
That’s 19 tens left
19 tens
19which is the same as 1 hundred and 9 tens.
Hundreds Tens Ones
203- 57
How many ones do you have now?
1913
Hundreds Tens Ones
203- 57
What is 13 ones minus 7 ones?
1913
6
Hundreds Tens Ones
203- 57
Finish subtracting.1913
641
You’ve Got It!
Subtract Across Zeroes
400- 9
3910
193
Subtract Across Zeroes
502- 14
4912
884
Subtract Across Zeroes
608- 234
5
473
10Slow Down
!
Don’t regroup if you don’t have to!
Subtract Across Zeroes
702- 213
6912
984