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12
Deadbolt Information (continued) Grade 2 Residential
Determine the numerical location of the fly in disks 2 and 3 and record them in the ‘Set to’ column in the worksheet. Note
that the setting of the first disk is the third number of the combination.
Simple mathematics are required to figure out the first and second combination numbers. Next, we will calculate the
combination for the disk locations shown.
To determine the second number of the existing combination, you must add settings one and two plus 1; in this case, 14 +
25 + 1 = 40. Because the total isn’t 50 or more, you don’t need to go further. If the total had been 50 or more, you would
need to subtract 50 until the answer is less than 50. Write the answer in the combination 2 box.
For the first number of the combination, add the set to column to get a total, e.g. 14 + 25 + 17 + 6 = 62. Because the total
is 50 or more, subtract 50 until the answer is less than 50. 62 – 50 = 12. That is the first combination number and may be
written into combination box 1.
DECODING
Disk Set to Formula Combination
The disk that contacts the dial
1
14
Combination = where set
14
3
The middle disk
2
25
Add 1 & 2 plus 1, subtract 50
until answer is less than 50
2
The disk that comes out first
3
17
Subtract 50 from Total until
answer is less than 50
1
Add 6
Total =
DECODING
Disk Set to Formula Combination
The disk that contacts the dial
1
14
Combination = where set
14
3
The middle disk
2
25
Add 1 & 2 plus 1, subtract 50
until answer is less than 50
40
2
The disk that comes out first
3
17
Subtract 50 from Total until
answer is less than 50
1
Add 6
Total =
DECODING
Disk Set to Formula Combination
The disk that contacts the dial
1
14
Combination = where set
14
3
The middle disk
2
25
Add 1 & 2 plus 1, subtract 50
until answer is less than 50
40
2
The disk that comes out first
3
17
Subtract 50 from Total until
answer is less than 50
12
1
Add 6
Total =
62
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