Lucky 7 Subtraction
38
Created by V. S. Bell H. H. Beam Elementary School Gastonia, NC 28052
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Lucky 7 Subtraction. Created by V. S. Bell H. H. Beam Elementary School Gastonia, NC 28052. Let’s subtract!. Lucky 7 Subtraction. Subtract means to take away!. Use the EOG grid paper for student work. Ask students to practice along with the PowerPoint. - PowerPoint PPT Presentation
Transcript of Lucky 7 Subtraction
Created by V. S. BellH. H. Beam Elementary School
Gastonia, NC 28052
Let’s subtract!
Subtract means to take away!
•Use the EOG grid paper for student work.
•Ask students to practice along with the PowerPoint.
•Give students the quiz problem at the end for assessment. Then, show the correct work.
Let’s subtract!
Subtract means to take away!
•How many more?•How many left?•Difference?•Have left?
Let’s subtract!
Subtract means to take away!
X= 10 Tens Row= 1 Ones Row
= 100 Hundreds Row
Remember:
Largest number goes first!
Problem #1
500 - 137 = n
500
-137
Step #1. Show how many you have in the beginning.
500 - 137 = n
500 X X X X X H
T
O
Step #2. Subtract the number of hundreds.
500 - 137 = n
1 X X X X X H
T
O
Step #2. Subtract the number of hundreds.
500 - 137 = n
1 X X X X X H
T
O
Step #3a: Subtract the number of tens.
500 - 137 = n
3 X X X X X H
T
O
Step #3b: Are there any tens showing?
500 - 137 = n
X X X X XNO! Please regroup!
H
T
O
Step #3c: Circle one hundred and
draw marks for 10 tens?
500 - 137 = n
X X X X XX H
T
O
Step #3d: Mark out the number of tens?
500 - 137 = n
3X X X X XX H
T
O
Step #4a: Subtract the number of ones?
500 - 137 = n
7 X X X X XX H
T
O
Step #4b: Are there any ones showing?
500 - 137 = n
X X X X XX H
T
ONO! Please regroup!
Step #4c: Circle 1 ten and make marks
for 10 ones.
500 - 137 = n
X X X X XX H
T
O
Step #4d: Mark out the number of ones.
500 - 137 = n
7
X X X X XX H
T
O
Step #5: How many hundreds
do you have left?.
500 - 137 =
X X X X XX3
3
H
T
O
Step #6: How many tens
do you have left?.
500 - 137 =
X X X X XX6
36
H
T
O
Step #7: How many ones
do you have left?.
500 - 137 =
X X X X XX
3
36 3
H
T
O
Congratulations! You have subtracted across zeroes with regrouping!
500
- 137
X X X X XX
36 3
H
T
O
Problem #2
700 - 246 = n
700
-246
Step #1. Show how many you have in the beginning.
700 X X X X X H
T
O
700 - 246 = n
X X
Step #2. Subtract the number of hundreds.
X X X X X H
T
O
2
700 - 246 = n
X X
Step #3a: Subtract the number of tens.
4 X X X X X H
T
O
700 - 246 = n
X X
Step #3b: Are there any tens showing?
X X X X XNO! Please regroup!
H
T
O
700 - 246 = n
X X
Step #3c: Circle one hundred and
draw marks for 10 tens?X X X XX H
T
O
X X
700 - 246 = n
X
Step #3d: Mark out the number of tens?
4X X X XX H
T
O
700 - 246 = n
X X X
Step #4a: Subtract the number of ones?
6 X XX X X H
T
O
700 - 246 = n
X
Step #4b: Are there any ones showing?
X X X
NO! Please regroup!
H
T
O
X XX
700 - 246 = n
Step #4c: Circle 1 ten and make marks
for 10 ones.X X X X H
T
O
XX
700 - 246 = n
Step #4d: Mark out the number of ones.
6
X X X X H
T
O
700 - 246 = n
XX
Step #5: How many hundreds
do you have left?.X X X4
4
H
T
O
700 - 246 =
X XX
Step #6: How many tens
do you have left?.X X X
5
35
H
T
O
700 - 246 =
X XX
Step #7: How many ones
do you have left?.X X X X X
4
45 4
H
T
O
XX
700 - 246 =
X X X X X
4 54
H
T
O
XX
Congratulations! You have subtracted across zeroes with regrouping!
700
- 246
Time for a Quiz
600-333 = n
600
-333
To Be Continued . . .
