# ROUNDING FRACTIONS - PowerPoint PPT Presentation

PPT – ROUNDING FRACTIONS PowerPoint presentation | free to download - id: 782c86-ZDM1M

The Adobe Flash plugin is needed to view this content

Get the plugin now

View by Category
Title:

## ROUNDING FRACTIONS

Description:

### ROUNDING FRACTIONS & MIXED NUMBERS- ESTIMATING SUMS AND DIFFERENCES. REVIEW Write each fraction in simplest form a) 3 = 1 18 6 b ... – PowerPoint PPT presentation

Number of Views:59
Avg rating:3.0/5.0
Slides: 32
Provided by: Pree158
Category:
Tags:
Transcript and Presenter's Notes

Title: ROUNDING FRACTIONS

1
ROUNDING FRACTIONS MIXED NUMBERS- ESTIMATING
SUMS AND DIFFERENCES.
2
REVIEW
• Write each fraction in simplest form
• a) 3 1
• 18 6
• b) 21 ¾
• 28
• c) 6 3
• 38 19

3
Review
• Write each improper fractions as a mixed number
• 11 1 1 15 1
2
• 10 10 9
3
• Find the LCD of 1 and 4
• 3 9
• LCD 9

4
ROUNDING FRACTIONS AND MIXED NUMBERS
5
ROUNDING FRACTIONS AND MIXED NUMBERS
• To round to the nearest half, we can use certain
guidelines
• ROUND UP If the numerator is almost as large as
the denominator, round the number up to the next
whole number.
• Example 7 rounds to 1
• 8

7 is almost as large as 8.
6
Rounding fractions
• ii) ROUND TO ½ If the numerator is about half
of the denominator, round the fraction to ½.
• Example 2 3 rounds to 2 ½
• 8

3 is about half of 8
7
ROUNDING FRACTIONS
• iii) ROUND DOWN If the numerator is much
smaller than the denominator, round the number
down to the whole number.
• Example 1/8 rounds to 0.

8
Examples- Round to the nearest half
• Round 3 1 to the nearest half.
• 6
• The numerator of 1 is much smaller than
• 6
• the denominator. So 3 1 rounds to 3.

• 6

9
Example 2
• Round 1 5 to the nearest half.
• 8
• The numerator 5 is about half of the
denominator 8. So, 1 5 1 ½
• 8

10
Example 3
• Round 8 8 to the nearest half.
• 9
• since the numerator of the fractional part is
almost equal to the denominator.
• So 8 8 rounds to 9.
• 9

11
• Round each number to the nearest half
• 8 1 8
• 12
• 2 9 3
• 10
• 5 ½
• 12

12
Use rounding to solve a problem
• If you need 1 ¼ kilograms of flour needed to make
sweets, should you buy 1 ½ kilograms or 1
kilogram?
• Answer Since 1 kilogram is less than 1¼
kilograms, we should round up and

13
BREAK
14
ESTIMATING SUMS AND DFFERENCES
15
REVIEW
• Estimate using rounding
• a) 2.3 7.9 4.1 2 8 4 14
• b) 9.3 4.758 9 5 4
• c) 12.006 5. 21 4.23 12 5 4 13

16
Estimating Sums and Differences
• We can estimate sums and differences of fractions
by rounding each fraction to the nearest half.

17
Estimate Sums
• Estimate 5 11
• 8 12

5 rounds to ½ 8
11 Rounds to 1 12
5 11 ½ 1 1 ½ 8 12
18
Estimate Differences
• ?Estimate 7 - 1
• 13 6

7 Rounds to ½ 13
1 Rounds to 0 6
7 - 1 ½ - 0 ½ 13 6
19
• Estimate
• 1. 2 7 ½ 1 1 ½
• 5 8
• 2. 6 4 ½ ½ 1
• 13 9
• 3. 9 - 4 1 ½ ½
• 10 9
• 4. 6 - 3 ½ - ½ 0
• 9 7

20
Mixed Number Sum And Differences
• We can estimate sums and differences of mixed
numbers by rounding each number to the nearest
whole number.

21
Example Mixed Number Sum
• Estimate 4 5 2 1
• 6 5
• 4 5 rounds to 5. 2 1 rounds to 2
• 6 5
• Estimate 5 2 7

22
Example Mixed Difference
• Estimate 2 5 - 2
• 8 5
• 2 5 - 2 2 ½ - ½ 2
• 8 5

23
• Estimate
• 3 1 1 5 3 2 5
• 8 6
• 2 7 - 1 8 3 2 1
• 8 9

24
Lets have fun
• http//www.thekidzpage.com/freekidsgames/xword/fai
rytalepuzzle.html

25
Round up to solve a problem
• The width of a room is 9 ¼ feet and length of a
room is 12 ½ feet. About how much border the room
will have?
• Width 10 feet Length 13
• Border is about 10 10 13 13 46

26
• Estimate the perimeter of rectangle if length is
13 9 inches an breadth is 2 ¼ in
• 11
• Length 14 and Breadth 2
• Perimeter 14 14 2 2 32

27
Practice Problems
• Round each number to the nearest half
• 1. 2 4/5 3
• 2. 4 4/9 4 ½
• 3. 6 11/12 7
• 4. 3 2/3 3 ½
• 5. 6 1/7 6

28
Practice Problems
• James walked 6 5 miles. To the nearest
• 8
• half male, how many miles did she walk.
• To the nearest half, he walked about 6 ½ miles.

29
Practice Problems
• Estimate
• 9/10 ½ 1 ½ ½
• 3/8 1/9 ½ - 0 ½
• 1 9/10 1 1/8 2 1 1
• 4 1/3 1 1/9 4 1 5
• 6 ¼ 2 5/6 3 3/8 6 3 3 12

30
Review
• To round to the nearest half
• If the numerator s almost as large as the
denominator, round the number to the nearest half
• If the numerator is about half of the
denominator, round the fraction to ½.
• If the numerator is much smaller than the
denominator, round the number down to the whole
number.

31
That's all for today