Transcript RNE Lesson 16 Luke

Find the value of each expression.
1.
1 3

2 4
2.
4.7 + 5.08
3.
2 52  1 12 
4.
 28
7
5.
10 – 3.58

Rational Number:
◦ a fraction made from integers

Sum:
◦ ADD

Difference:
◦ Subtract

5
8
11
6
Rounding:
◦ Choose easy #’s close to hard #’s.
3
4
Decimals
 less than one
◦ round to 0, 0.5 or 1

more than one
◦ round to the nearest integer (whole #)
Fractions
 less than one
◦ round to 0, ½ or 1

mixed numbers
◦ round to the nearest integer (whole #)

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
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0.2 rounds to ________
0.4 rounds to ________
0.7 rounds to ________
0.75 rounds to ________
1.6 rounds to ________
¼ rounds to _________
1/3 rounds to _________
3/5 rounds to _________
1 ¾ rounds to _________
Estimate the value of – 4.23 + 2.8.

Both numbers are more than one and should be
rounded to nearest integer.
◦ – 4.23 → – 4
◦ 2.8 → 3

– 4 + 3 = –1

– 4.23 + 2.8 ≈ –1
Estimate the value of 0.94 – (–0.43).

Both numbers are less than one unit away from zero
and should be rounded to the nearest 0.5.
◦ 0.94 → 1
◦ – 0.43 → – 0.5

1 – (–0.5) = 1 + 0.5 = 1.5

0.94 – (–0.43) ≈ 1.5
Estimate the value of 



1 4
 .
7 9
Each fraction is less than 1 unit from zero so round to the
1
1
nearest .

0
2
7
4
1

9
2
1 1
0 
2 2
1 4 1
  
7 9 2
Estimate the value of  1 13  2 78 .

Each fraction is more than 1 unit from zero so round to the
nearest integer.
 1 13  1
2 78  3


 1  3  1  (3)  4
 1 13  2 78  4
Estimate the value of each expression.
1.
2.
3.
3.21 + 6.3
3 9
 
7 10
8 14   2 23 
4.
0.13 – 0.925
5.
Matt bought
2
2 121 pounds of apples, 1 56 pounds of grapes and 4 3 pounds of
potatoes. How many pounds did he buy?
Describe a time when you used estimating in a situation
outside of math class.