Patterns: Find a Rule Lesson Topic Index | Grade 4 Math | Elementary Test Prep | StudyZone

You can use patterns to decide what numbers come next in a series of numbers.

Look for a number pattern.

 2, 5, 8, 11, __, __, __
• What is the difference between each number?

• Each number is 3 more than the one before it.

• Use the number pattern to find the next three numbers.

 11+3=14   14+3=17  17+3=20 2, 5, 8, 11, 14, 17, 20

• What's the difference between the number.

• Each number is 2 less than the number before.

• Use the number pattern to find the next three numbers.

 11, 9, 7,__, __, __, 11-2=9  9-2=7  7-2=5  5-2=3  3-2=1 11, 9, 7, 5, 3, 1

You can use number patterns to complete a table.

The number pattern is the rule for the table.

You always look for the pattern from the
INPUT to the OUTPUT.

 INPUT 2 3 4 5 9 10 OUTPUT 5 6 7

What's the Rule?____________________

What do you have to do to each INPUT number to get the OUTPUT number below it?

 2+3=5   3+3=6   4+3=7
• You add 3 to each INPUT number to get the OUTPUT number.

• The rule for this table is Add 3.

• Use the rule to complete the table. Then write the rule.

 INPUT 2 3 4 5 9 10 OUTPUT 5 6 7 8 12 13

Find the number pattern to complete the table.

Then write the rule.

 INPUT 11 10 9 5 7 6 OUTPUT 7 6 5

Rule : ________________

• You Subtract 4 from each INPUT number to get the OUTPUT number.

 11-4=7   10-4=6   9-4=5
• The rule for this table is Subtract 4.

 INPUT 11 10 9 5 7 6 OUTPUT 7 6 5 1 3 2

Rule:  Subtract 4

Let's Practice!