Lucky 7 Subtraction

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Lucky 7 Subtraction
Created by V. S. Bell H. H. Beam Elementary
School Gastonia, NC 28052
2
Lets subtract!
Lucky 7 Subtraction
Subtract means to take away!
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• 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.

4
Lets subtract!

• How many more?
• How many left?
• Difference?
• Have left?

Subtract means to take away!
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Lets subtract!
X
100 Hundreds Row
10 Tens Row
1 Ones Row
Remember Largest number goes first!
Subtract means to take away!
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Problem 1
500 -137
500 - 137 n
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Step 1. Show how many you have in the beginning.
500
X
X
X
X
X
H T O
500 - 137 n
8
Step 2. Subtract the number of hundreds.
1
X
X
X
X
X
H T O
500 - 137 n
9
Step 2. Subtract the number of hundreds.
1
X
X
X
X
X
H T O
500 - 137 n
10
Step 3a Subtract the number of tens.
X
X
X
X
X
H T O
3
500 - 137 n
11
Step 3b Are there any tens showing?
X
X
X
X
X
H T O
NO! Please regroup!
500 - 137 n
12
Step 3c Circle one hundred and draw marks for
10 tens?
X
X
X
X
X
X
H T O
500 - 137 n
13
Step 3d Mark out the number of tens?
X
X
X
X
X
X
H T O
3
500 - 137 n
14
Step 4a Subtract the number of ones?
X
X
X
X
X
X
H T O
7
500 - 137 n
15
Step 4b Are there any ones showing?
X
X
X
X
X
X
H T O
NO! Please regroup!
500 - 137 n
16
Step 4c Circle 1 ten and make marks for 10
ones.
X
X
X
X
X
X
H T O
500 - 137 n
17
Step 4d Mark out the number of ones.
X
X
X
X
X
X
H T O
7
500 - 137 n
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Step 5 How many hundreds do you have left?.
3
X
X
X
X
X
X
H T O
3
500 - 137
19
Step 6 How many tens do you have left?.
X
X
X
X
X
X
H T O
6
3
6
500 - 137
20
Step 7 How many ones do you have left?.
X
X
X
X
X
X
H T O
3
3
6
3
500 - 137
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Congratulations! You have subtracted across
zeroes with regrouping!
X
X
X
X
X
X
H T O
500 - 137
3
6
3
22
Problem 2
700 -246
700 - 246 n
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Step 1. Show how many you have in the beginning.
700
X
X
X
X
X
X
X
H T O
700 - 246 n
24
Step 2. Subtract the number of hundreds.
2
X
X
X
X
X
X
X
H T O
700 - 246 n
25
Step 3a Subtract the number of tens.
X
X
X
X
X
X
X
H T O
4
700 - 246 n
26
Step 3b Are there any tens showing?
X
X
X
X
X
X
X
H T O
NO! Please regroup!
700 - 246 n
27
Step 3c Circle one hundred and draw marks for
10 tens?
X
X
X
X
X
X
X
X
H T O
700 - 246 n
28
Step 3d Mark out the number of tens?
X
X
X
X
X
X
X
X
H T O
4
700 - 246 n
29
Step 4a Subtract the number of ones?
X
X
X
X
X
X
H T O
6
700 - 246 n
30
Step 4b Are there any ones showing?
X
X
X
X
X
X
H T O
NO! Please regroup!
700 - 246 n
31
Step 4c Circle 1 ten and make marks for 10
ones.
X
X
X
X
X
X
H T O
700 - 246 n
32
Step 4d Mark out the number of ones.
X
X
X
X
X
X
H T O
6
700 - 246 n
33
Step 5 How many hundreds do you have left?.
4
X
X
X
X
X
X
H T O
4
700 - 246
34
Step 6 How many tens do you have left?.
X
X
X
X
X
X
H T O
5
3
5
700 - 246
35
Step 7 How many ones do you have left?.
X
X
X
X
X
X
X
H T O
4
4
5
4
700 - 246
36
Congratulations! You have subtracted across
zeroes with regrouping!
X
X
X
X
X
X
X
H T O
700 - 246
4
5
4
37
Time for a Quiz
600 -333
600-333 n
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To Be Continued . . .