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Math practice worksheet with input/output tables for finding rules and completing missing values.

A math worksheet titled "Practice" with eight input/output tables, each requiring students to find the rule and fill in missing values, featuring a "Learn Bright" logo in the top right corner.

A math worksheet titled "Practice" with eight input/output tables, each requiring students to find the rule and fill in missing values, featuring a "Learn Bright" logo in the top right corner.

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Show Answer Key & Explanations Step-by-step solution for: Addition Input/Output Tables
Let’s solve each table one by one. We need to find the rule that turns Input (x) into Output (y), then use it to find the missing output.

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Table 1:
Input: 3 → Output: 6
Input: 5 → Output: 8
Input: 7 → Output: 10
Input: 9 → Output: ?

Look at the pattern:
3 + 3 = 6
5 + 3 = 8
7 + 3 = 10
So, rule is: x + 3

Then 9 + 3 = 12

Missing output: 12

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Table 2:
Input: 0 → Output: 11
Input: 1 → Output: 12
Input: 2 → Output: 13
Input: 3 → Output: ?

Pattern:
0 + 11 = 11
1 + 11 = 12
2 + 11 = 13
Rule: x + 11

Then 3 + 11 = 14

Missing output: 14

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Table 3:
Input: 6 → Output: 18
Input: 8 → Output: 20
Input: 10 → Output: 22
Input: 12 → Output: ?

Check differences:
6 × 3 = 18
8 × 2.5? No — wait, try adding:

6 + 12 = 18
8 + 12 = 20
10 + 12 = 22
Ah! Rule: x + 12

Then 12 + 12 = 24

Missing output: 24

Wait — let me double-check with multiplication:

6 × 3 = 18
8 × 2.5 = 20? Not consistent.

But 6 → 18 (+12)
8 → 20 (+12)
10 → 22 (+12)
Yes, definitely +12

So 12 + 12 = 24

Confirmed: 24

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Table 4:
Input: 10 → Output: 19
Input: 20 → Output: 29
Input: 30 → Output: 39
Input: 40 → Output: ?

Pattern:
10 + 9 = 19
20 + 9 = 29
30 + 9 = 39
Rule: x + 9

Then 40 + 9 = 49

Missing output: 49

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Table 5:
Input: 10 → Output: 16
Input: 11 → Output: 17
Input: 12 → Output: 18
Input: 13 → Output: ?

Clearly:
10 + 6 = 16
11 + 6 = 17
12 + 6 = 18
Rule: x + 6

Then 13 + 6 = 19

Missing output: 19

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Table 6:
Input: 2 → Output: 4
Input: 4 → Output: 6
Input: 6 → Output: 8
Input: 8 → Output: ?

Pattern:
2 + 2 = 4
4 + 2 = 6
6 + 2 = 8
Rule: x + 2

Then 8 + 2 = 10

Missing output: 10

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Table 7:
Input: 4 → Output: 9
Input: 8 → Output: 13
Input: 12 → Output: 17
Input: 16 → Output: ?

Check:
4 + 5 = 9
8 + 5 = 13
12 + 5 = 17
Rule: x + 5

Then 16 + 5 = 21

Missing output: 21

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Table 8:
Input: 100 → Output: 101
Input: 150 → Output: 151
Input: 200 → Output: 201
Input: 250 → Output: ?

Pattern:
100 + 1 = 101
150 + 1 = 151
200 + 1 = 201
Rule: x + 1

Then 250 + 1 = 251

Missing output: 251

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Final Answer:
12, 14, 24, 49, 19, 10, 21, 251
Parent Tip: Review the logic above to help your child master the concept of input tables worksheet.
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