Transcript Estimating with Fractions

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Objective
Estimate sums, differences, products, and quotients
of fractions and mixed numbers
Vocabulary
Compatible numbers
Numbers that are easy to compute mentally
Math
Symbols
Approximately equal to

Example 1 Estimate with Mixed Numbers
Example 2 Estimate with Mixed Numbers
Example 3 Estimate with Fractions
Example 4 Estimate with Fractions
Example 5 Estimate with Fractions
Example 6 Use Compatible Numbers
Example 7 Use Compatible Numbers
1/7
Estimate
Write problem
Round first fraction to 5
Round second fraction to 4
Add
5+4
9
Answer:  9
1/7
Estimate
Answer:  8
1/7
Estimate

Write problem
Round first fraction to 8

Round second fraction to 2
Multiply
82
Answer:  16
2/7
Estimate

Answer:  15
2/7
Estimate
Write problem
Since fractions are less
than 1, round to nearest
half
Round first fraction to
Round second fraction to
1
Add
Answer:  1
3/7
Estimate
Answer: 1
3/7
Estimate
Write problem
Since fractions are less
than 1, round to nearest
half
Round first fraction to
Round second fraction to 0
Be cautious and do not
round to 0 often, only when
appropriate
Answer: 
Subtract
4/7
Estimate
Answer: 1
4/7
Estimate
Write problem
Since fractions are less
than 1, round to nearest
half
Round first fraction to 1
Round second fraction to
2
Answer:  2
Divide
5/7
Estimate
Answer:
5/7
Estimate


 20
53
15
Write problem
To have a more accurate answer
when rounding, sometimes look
for a compatible number with the
denominator
Round 21 to a number
compatible with 4 like 20
Divide 20 by denominator of 4
Multiply by numerator of 3
Answer:  15
6/7
Estimate

Answer:  12
6/7
Write problem
Estimate
16  4
4
Answer:  4
7/7
*
Estimate
Answer:  5
7/7
Assignment
Lesson 6:1
Estimating with Fractions
11 - 34 All