Bell Ringer

1
Bell Ringer
What is the place value of the 3 in the number
32,005,000
Ten-millions
Round 6.845 to the nearest tenth.
6.8
Round 42,580 to the nearest thousand.
43,000
What is the mathematical term for the x in 8 x?
variable
2
Today's Math Objective
Create and explain patterns and algebraic
relationships.
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Today's Math Lesson
Sometimes you can solve a problem by finding
and continuing a pattern.

Try to find rules in a pattern to explain them...
3, 9, 27 What is the rule?
Multiply by 3
34, 30, 26, 22 What is the rule?
Subtract 4
Or use a rule to write a pattern
Use the rule divide by 2 to make a pattern
starting with 200.
200, 100, 50, 25
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Today's Math Lesson (cont)
An input/output relationship also follows a rule
and shows a pattern. If you know the input for
the machine below, you can add to find the
output.If you know the output, you can subtract
to find the input. Subtraction undoes
addition, so addition and subtraction are Inverse
operations.
Inverse operation 2 operations that have the
opposite effect. For example Addition and
subtraction 9 2 7 7 2 9
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Today's Math Lesson (cont)
RULE Add 100
Subtract to find x.
850 100 x x 750
RULE Subtract 5
RULE Multiply by 3
What is the rule?
45
15
20
30
28
45
Divide by 4!
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Activity
MathScape PATTERNS IN NUMBERS AND SHAPES Pages
324-325 Calendar Tricks
Make up a trick with diagonals like the ones
shaded. ThinkCan I add, subtract, multiply, or
divide to find a pattern?
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Today's Math Practice

• Identify the rule in the pattern.
• 1) 24, 19, 14, 11, 6 2) 2, 10, 50, 250
  3) 2, 11, 20
• Complete each table. Determine the rule for the
  table on the right and
• and complete it.

RULE ???
RULE Divide by 2
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Today's Math Practice

• Identify the rule in the pattern.
• 1) 24, 19, 14, 11, 6 2) 2, 10, 50, 250
  3) 2, 11, 20
• Complete each table. Determine the rule for the
  table on the right and
• and complete it.

Subtract 5
Multiply by 5
Add 9
Add 7
RULE ???
RULE Divide by 2
250
19
25
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Closure
Make up a sequence of numbers with a pattern
and see if your partner can guess your pattern.